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Get college assignment help at uniessay writers (c) A farm brings 15 tons of watermelon to market. Find a 90% confidence interval for the population mean cash value of this crop. What is the margin of error? Hint: 1 ton is 2000 pounds. (Round your answers to two decimal places.)

a mandatory competency test for high school sophmores has a normal distribution with a mean of 400 and a standard deviation of 100. The top 3% of students receive $500. What is the minimum score you would need to receive this award?

5. In a survey of 2480 golfers, 15% said they were left-handed. Construct to the 95% confidence interval for the population proportion p.

. Dr. Zak also gave his students the Beck Depression Inventory (BDI). The correlation between his test and the BDI was r =.14. Evaluate this correlation. What does this correlation tell us about the relationship between these two instruments?

Counselors at an exclusive private college look carefully at the applications from high school students seeking admission to the college. One of their criteria is that these students must score in the top 3.5% of all students who took the required entrance exam. The exam is constructed such that the scores are normally distributed with an average of 1500 and a standard deviation of 150 The minimum exam score necessary for applicants to be further considered for admission is:

A study of nickels showed that the standard deviation of the weight of nickels is 300 milligrams. A coin counter manufacturer wishes to find the 90% confidence interval for the average weight of a nickel. How many nickels does he need to weigh to obtain an average accurate to within 10 milligrams?

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Suppose Y=(3X-2)^2 and E[x]=2, var(X)=5. Find E[Y]

The average speed of vehicles on a highway is being studied. a. Suppose observations on 50 vehicles yielded a sample mean of 65 mph. Assume that the standard deviation of vehicle speed is known to be 6 mph. Determine the two-sided 99% confidence intervals of the mean speed. b. In part (a), how many additional vehicles’ speed should be observed such that the mean speed can be estimated to within ± 1 mph with 99% confidence? c. Suppose John and Mary are assigned to collect data on the speed of vehicles on this highway. After each person has separately observed 100 vehicles, what is the probability that John’s sample mean will exceed Mary’s sample mean by 2 mph?

4. An experiment involving n independent trials with success probability p is repeated 4 times. The following number of successes during each set of trials is listed below: Number of successes: 6, 5, 9, 7 a. If the number of trials during each experiment is 12, determine the maximum likelihood estimate for the probability of success, p. b. Repeat part (a) if we know that the success probability must be either 0.5 or 0.75. c. If we know the probability of success is 0.8, determine the maximum likelihood estimate for the number of trials in each experiment, n.

Get college assignment help at uniessay writers 3. The lifetimes of 10 light bulbs (in hours burned) were recorded as follows: 51, 62, 45, 56, 73, 71, 63, 58, 59, 54 Assume the lifetime of a light bulb comes from a normal distribution. a. Estimate the population variance (sigma^2) . b. Compute a 99 percent two-sided confidence interval for population variance (sigma^2). c. Compute a value V that enables us to state, with 90 percent confidence, that population variance (sigma^2) is less than V.

Linda invents her money in a portfolio that consists of 70% Fidelity 500 Index Fond and 30% Fidelity Diversified International Fund. Suppose that in the long run the annual real return X on the 500 Index Fund has mean 9% and standard deviation 19%, the annual real return Y on the Diversified International Fund has mean 11% and standard deviation 17%, and the correlation between X and Y is 0.6. (a)The return on Linda’s portfolio is R=0.7X 0.3Y. What are the mean and standard deviation of R? (b)The distribution of returns is typically roughly symmetric but with more extreme high and low observations than a Normal distribution. The average return over a number of years, however, is close to normal. If Linda holds her portfolio for 20 years, what is the approximate probability that her average return is less than 5%? (c)The calculation you just made is not overly helpful, because Linda isn’t really concerned about the mean return R-bar. To see why, suppose that her portfolio returns 12% this year and 6% next year. The mean return for the two years is 9%. If Linda starts with $1000, how much does she have at the the end of the first year? At the end of the second year? How does this amount compare with what she would have if both years had the mean return, 9%? Over the ordinary mean R-bar and the geometric mean, which reflects the fact that returns in successive years multiply rather than add.

Question 1 (1 point)Save For which of the following counts would a binomial probability model be reasonable? the number of sevens in a randomly selected set of five random digits from your table of random digits the number of hearts in a hand of 5 cards dealt from a standard deck of 52 cards that has been thoroughly shuffled the number of tosses of a coin it takes until you get a “tails” the number of phone calls received in a one hour period Question 2 (1 point)Save In an instant lottery, your chances of winning are 0.2. If you play the lottery five times and outcomes are independent, the probability that you win at most once is 0.4096 0.2 0.7373 0.0819 Question 3 (1 point)Save At a large midwestern college, 4% of the students are Hispanic. A random sample of 20 students are selected. Let X denote the number of Hispanics among them. The mean of X is 0.8 1.6 1.2 0.4 Question 4 (1 point)Save At a large midwestern college, 4% of the students are Hispanic. A random sample of 20 students are selected. Let X denote the number of Hispanics among them. The standard deviation of X is 0.71 0.87 0.768 0.8 Question 5 (1 point)Save At a large midwestern college, 4% of the students are Hispanic. A random sample of 20 students are selected. Let X denote the number of Hispanics among them. What is the probability that exactly one of the students is Hispanic? 0.8103 0.6317 0.04 0.3683 Question 6 (1 point)Save At a large midwestern college, 4% of the students are Hispanic. A random sample of 20 students are selected. Let X denote the number of Hispanics among them. What is the probability that there will be at most 1 of the students that is Hispanic? 0.3683 0.1897 0.8103 0.08 Question 7 (1 point)Save A college basketball player makes 24% of his 3-point shots. Assuming that the shots are independent and the player takes 6 3-point shots, what is the probability that the player makes exactly 3 of the shots? 0.0287 0.8786 0.1214 0.5 Question 8 (1 point)Save A college basketball player makes 24% of his 3-point shots. Assuming that the shots are independent and the player takes 6 3-point shots, what is the probability that the player makes at most 4 shots? 0.0038 0.0287 0.9962 0.9674 Question 9 (1 point)Save A college basketball player makes 24% of his 3-point shots. Assuming that the shots are independent and the player takes 6 3-point shots, what is the probability that the player makes more than 4 of the shots? 0.0038 0.9998 0.9962 0.0326 Question 10 (1 point)Save A college basketball player makes 24% of his 3-point shots. Assuming that the shots are independent and the player takes 6 3-point shots, what is the expected number if shots the player will make? 1.44 1.0944 2 1 Question 11 (1 point)Save A local politician claims that 1 in 5 automobile accidents involves a teenage driver. He is advocating increasing the age at which teenagers can drive alone. Over a 2-month preiod there are 67 accidents in your city, and only 9 of them involved a teenage driver. If the politician is correct, what is the chance that you would observe 9 or fewer accidents involving a teenage driver? 0.0524 0.200 1343 0.0901 Question 12 (1 point)Save An article in Parenting magazine reported that 60% of Americans needed a vacation after visiting their families for the holidays. Suppose this is the true proportion of Americans who feel this way. A random sample of 100 Americans is taken. What is the probability that less than 50% of the people in the sample feek that they need a vacation after visiting their families for the holidays? 0.1446 0.4000 0.0062 0.0207

13. If r = 0.84 and N = 5, the value of tobt for the test of the significance of r is ____. Student Response Feedback 1. 1.96 2. 3.46 3. 2.68 4. 2.40 11. If µ = 30, s = 5.2, = 28.0, s = 6.1 and N = 13, the value of the most powerful statistic to test the significance of the sample mean is ____. Student Response Feedback 1. -1.39 2. -1.18 3. 2.18 4. 1.96 8. Exhibit 13-1 A researcher believes that women today weigh less than in previous years. To investigate this belief, he randomly samples 41 adult women and records their weights. The scores have a mean of 111 lbs. and a standard deviation of 12.4. A local census taken several years ago shows the mean weight of adult women was 115 lbs. Refer to Exhibit 13-1. Using a = 0.011 tail, the appropriate critical value is ____. Student Response Feedback 1. -2.423 2. -1.684 3. -4.423 4. 5.684

3a. In a battleground state, 40% of all voters are Republicans. Assuming that there are only two parties – Democrat and Republican, if two voters are randomly selected for a telephone survey, what is the probability that they are both Republicans? Round your answer to 4 decimal places

63% of men consider themselves pro baseball fans randomly select 10 men and ask each if he considers himself a pro baseball fan. find the probability that the number who consider themselves baseball fans is (A) exactly 8, (B) at least 8, (C) less then 8

An airport with five security check points wants to compare the mean times that passengers have to wait to get through airport security between 8AM and 9AM on Monday morning among the five check points. Data File Wait Times – PSIII gives the wait times for six randomly selected passengers arriving between 8 and 9 AM on a Monday morning at each of the check points.

At some point too much stimulation will limit the ability to focus and pay attention. What would happen to the size and the sign of the correlation coefficient if we correlated these two variables?

. A computer manufacturer is interested in offering a new model with a state-of-the-art microprocessor that the production department claims has a faster calculation speed than any machine the company sold last year. For years, the CEO has kept in his arsenal a brute force program that commands the machines to find and display the first 10,000 prime numbers (a number evenly divisible only by itself and 1) in a list box on the screen. The first 10 prime numbers are 1, 2, 3, 5, 7, 11, 13, 17, 19, and 23. Last year’s fastest computers averaged 4.35 seconds. Sixteen machines, hot off the assembly line and equipped with the new chip, executed the same program. The times (in seconds) that each computer required to list the prime numbers were as follows: 3.65 4.29 3.78 4.21 3.75 3.68 3.71 3.64 3.75 4.03 3.75 4.12 3.73 3.88 3.63 3.59 a. State the appropriate null and alternative hypotheses. b. Calculate the test statistic. c. At = 0.01, should the CEO reject the null hypothesis? d. What conclusion can the CEO draw?

35% of adult Americans are regular voters. A random sample of 250 adults in a medium-sized college town were surveyed, and it was found that 110 were regular voters. Estimate the true proportion of regular voters with 90% confidence and comment on your results.

Airline Bookings Air-America has a policy of booking as many as 14 people on an airplane that can seat only 12. (Past studies have revealed that only 92% of the booked passengers actually arrive for the flight.) Using the Binomial distribution, find the probability that if Air-America books 14 people on a flight, not enough seats will be available. (Hint: The answer is 69.0036%… but how do you get it?)

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November 3, 2019