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An investment broker reports that the yearly returns on common stocks are approximately normally distributed with a mean return of 12.4 percent and a standard deviation of 20.6 percent. On the other hand, the firm reports that the yearly returns on tax-free municipal bonds are approximately normally distributed with a mean return of 5.2 percent and a standard deviation of 8.6 percent. (a) Use the investment broker’s report to estimate the maximum yearly return that might be obtained by investing in tax-free municipal bonds.
The accomanying table is a one way, independent groups ANOVA summary table with part of material missing. source ss df s2 fobt btw groups 1253.68 3 within groups total 5016.40 39 a. fill the missing values. b. how many groups are there in the experiment? c. assuming an equal number of subject are there in each group d. what is the value of F crit, using alpha 0.05? e. is there a significant effect?
At a certain university the mean income of parents of the entering class is reported to be $91,600. The president of another university feels that the parents’income for her entering class is greater than $91,600. She surveys 100 randomly selected families and finds the mean income to be $96,321 with a standard deviation of $9555.With a0.05, is she correct?
A government study claims that university students spend, on average, more than ¿100 each week on alcohol. To test this claim a sample of 25 students, revealed a sample mean of ¿105 spend each week on alcohol, with a sample standard deviation of ¿25. Do the data support the study’s claim? Test the above hypothesis at the = 0:05 signicance level.
what critical value t* from table D should be used to calculate the margin of error for a confidence interval for the mean of the population in each of the following situations?
Of 144 adults selected randomly from one town, 31 of them smoke. Construct a 99% confidence interval for the percentage of all adults in the town who smoke. (For intermediate calculations, use 2 decimal places for percentages or 4 decimal places for proportions.) 2) A) (15.9%, 27.2%) B) (12.7%, 30.3%) C) (14.8%, 28.2%) D) (13.5%, 29.5%) E) (13.5%, 28.2%)
Data collected over a long period of time showed that a particular genetic defect occurs in 1 of every 1000 children. Let X be the random variable “number of children with genetic defect in a sample of 50,000 children examined”. The records of a medical clinic show X = 60 children.  a. What is the probability of observing a value of X equal to 60 or more?  b. Would you say that the observation of X = 60 children with genetic defect was rather unlikely?
What does y i dot bar mean?
health insurance policy is designed in such a way that a healthy person has a negative expected value, and an ailing one has a positive expected value. true or false
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The weight of a product is normally distributed with a standard deviation of .5 ounces. What should the average weight be if the production manager wants no more than 6% of the products to weigh more than 7.4 ounces?
i need the case problem 2 on motion picture industry on page 155 from the book modern business statistics 3e aderson, sweeney, williams, i need it by tommorow because its due tommorow, i would truly appreciate it. I sent you an attatched file and i need the answers to these questions. Use the numerical methods of descriptive statistics presented in this chapter to learn how these variables contribute to the success of a motion picture. Include the following in your report. 1.Descriptive statistics for each of the four variables along with a discussion of what the descriptive statistics tell us about the motion picture industry? 2.What motion picture, if any, should be considered high performance outliers? Explain 3.Descriptive statistics showing the relationship between total gross sales and each of the other variables.Discuss
Does the data provide sufficient evidence that the mean rod diameter exceeds 8.20 mm using a 0.05 level of significance? Please use the four-step process.
the associated press reported that 71% of americans ages 25 and older are overweight. assume this is true. a random sample of 12 adults 25 or older is selected from general population. what is the probability that you have less than 15%snickers in your bag?
Suppose that a particular trait (such as eye color or left handedness) of a person is classified on the basis of one pair of genes, and suppose that d represents a dominant gene and r a recessive gene. Thus, a person with dd genes is pure dominance, one with rr is pure recessive, and one with rd is hybrid. The pure dominance and the hybrid are alike in appearance. Children receive 1 gene from each parent. If, with respect to a particular trait, 2 hybrid parents have a total of 4 children, what is the probability that 3 of the 4 children have the outward appearance of the dominant gene?
People tend to evaluate the quality of their lives relative to others around them. In a demonstration of this phenomenon, Frieswijk, Buunk, Steverink, and Slaets (2004) conducted interviews with frail elderly people. In the interview, each person was compared with fictitious others who were worse off. After the interviews, the elderly people reported more satisfaction with their own lives. Following are hypothetical data similar to those obtained in the research study. The scores are measures on a life-satisfaction scale for a sample of n=9 elderly people who completed the interview. Assume that the average score on this scale is u=20. Are the data sufficient to conclude that the people in this sample are significantly more satisfied than others in the general population? Use a one-tailed test with an alpha level = .05. The life-satisfaction scores for the sample are 18, 23, 24, 22, 19, 27, 23, 26, 25.
A report states that 44% of home owners have a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 5 percentage points with 92% confidence?
A box stored in a warehouse contains 100 identical parts of which 10 are defective and 90 are non-defective. Three parts are selected without replacement. What is the probability that at least one part is defective?
If (X,Y) is a random vector then for any a in the range of X, and b in the range of Y, P(X < a and Y < b)=P(X < a)P(Y < b) True or False
For any random variable X, V[3-X]=V[X] where V stands for variance True or False
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