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Get college assignment help at uniessay writers 1. For a hypothesis test with an independent-measures t, the larger the two sample variances are, the greater the likelihood that you will reject the null hypothesis. (Points: 1) True False 2. If two samples both have n = 5 and SS = 40, then the pooled variance is 10. (Points: 1) True False 3. For an independent-measures t statistic, the estimated standard error measures how much difference is reasonable to expect between the two sample means if there is no treatment effect. (Points: 1) True False 4. An independent-measures research study uses two samples, each with n = 8 participants. If the data produce a t statistic of t = 2.50, then which of the following is the correct decision for a two-tailed hypothesis test? (Points: 1) Reject the null hypothesis with a = .05 but fail to reject with a = .01. Reject the null hypothesis with either a = .05 or a = .01. Fail to reject the null hypothesis with either a = .05 or a = .01. Cannot answer without additional information 5. An independent-measures research study uses two samples, each with n = 8 participants. If the data produce a t statistic of t = 2.10, then which of the following is the correct decision for a two-tailed hypothesis test? (Points: 1) Reject the null hypothesis with a = .05 but fail to reject with a = .01. Reject the null hypothesis with either a= .05 or a= .01. Fail to reject the null hypothesis with either a = .05 or a = .01. Cannot answer without additional information 6. A repeated-measures research study comparing two treatments with a set of 10 scores in each treatment will produce a t statistic with df = 19. (Points: 1) True False 7. The repeated-measures t statistic can be used with either a repeated-measures or a matched-subjects design. (Points: 1) True False 8. A set of n = 16 difference scores has a mean of MD = 4 and a variance of s2 = 36. Cohen’s d for this sample is d = 4/6. (Points: 1) True False 9. Assuming that other factors are held constant, which of the following would tend to decrease the value of the t statistic (make it closer to zero)? (Points: 1) increase the sample size increase the sample mean difference increase the sample variance None of the other 3 options would cause a decrease in the value of t. 10. A repeated-measures experiment and an independent-measures experiment both produce t statistics with df = 20. How many individuals participated in each experiment? (Points: 1) n = 21 for independent-measures and n = 21 for repeated measures n = 21 for independent-measures and n = 11 for repeated measures n = 22 for independent-measures and n = 21 for repeated measures n = 22 for independent-measures and n = 11 for repeated measures

How many questions must the test contain in order to reduce

How many questions must the test contain in order to reduce the standard deviation of Jodi’s proportion of correct answers to half its value for a 100-item test?

Almanac, 73% of adult smokers started smoking before turning 18 years

Almanac, 73% of adult smokers started smoking before turning 18 years old. Suppose 6 smokers 18 years old or older are randomly selected and the number of smokers who started smoking before 18 is recorded

Define a parameter.

Define a parameter.

Please resubmit the assignment to answer the other questions by Fridday

Please resubmit the assignment to answer the other questions by Fridday November 5, 2010. Thanks! Stephanie

Variation “within” the ANOVA treatments represents A. Random variation B. Differences

Variation “within” the ANOVA treatments represents A. Random variation B. Differences between group means C. Differences between group variances D. The effect of sample size

A mail order computer business has six telephone lines. Let X

A mail order computer business has six telephone lines. Let X denotes the number of lines in use at a specified time. Suppose the pmf of X is as given in table below

Assume that the random variables x and y are jointly normal

Assume that the random variables x and y are jointly normal random variables with density function given by: 2 2 2 2 2 2 1 1 2 2 1 2 1 ( , ) exp x y ( ) x x y y f x y x rxy y πσ σ r r σ σ σ σ ⎧⎪ − ⎛ ⎞⎪⎫ = ⎨ ⎜ − ⎟⎬ − ⎪ − ⎜ ⎟⎪ ⎩ ⎝ ⎠⎭ Where r=0.5, σ X =σY =1. Define the new random variables w and z as: z xcos ysin w xsin ycos = − = θ θ θ θ where θ =π/4. a) Find θ such that rZW=0. b) Find the condition that makes the two random variables have circular symmetry. c) Let r=0 and σ x =σ y and define the new random variables R and θ such that: x = Rcosθ and y = Rsinθ • Find the joint PDF of R and θ; i.e. f (R,θ ) . Are R and θ independent? Use: ( 1 ) 2 1 1 d tan (x) dx x − = d) If z = x y • prove that: 1 2 1 1 2 1 ( ) tan y x z x z r F z r σ σ π σ − ⎛ − ⎞ = ⎜ ⎟ ⎜ − ⎟ ⎝ ⎠ • prove that (x 0, y 0) (x 0, y 0) 1 2

The distribution system for the Herman Company consists of three plants,

The distribution system for the Herman Company consists of three plants, two warehouses, and four customers. Plant capacities and shipping costs per unit (in $) from each plant to each warehouse are as follows.

You are the manager at a company and are asked to

You are the manager at a company and are asked to present a report on the year-to-date performance of your division. What type of statistical information would you include in your report? In particular, which descriptive statistics (mean, median, standard deviation, etc.) do you think would best represent the main aspects of the performance of your division? What types of graphical presentation (histogram, dot plot, stem-and-leaf, bar chart, etc.) would you include? Explain your reasoning

2. A local newspaper, the West Times, in state A reported

Get college assignment help at uniessay writers 2. A local newspaper, the West Times, in state A reported that a recent poll indicated that 40% of the population was in favor of a high speed rail construction project in the state, with a margin of error of ±2 percent. What does this mean? Can we infer how many people were questioned? (Hint: it is common practice for the news media to present 95% confidence intervals.)

a drama fan has taped 9 episodes (on nine different videotapes)of

a drama fan has taped 9 episodes (on nine different videotapes)of a drama. however, he only has time to watch four episodes. suppose he selects four tapes at random. 1. how many different ordered arrangements of episodes are possible? 2. if the finale is on tape, what is the probability he will select and watch this episode last.

“2. The commuting times of a sample of 30 Berkeley students

“2. The commuting times of a sample of 30 Berkeley students are measured and the average value observed is 22 minutes. Compute a 99 percent two-sided confidence interval for the mean commuting time if the population variance is not known, but the sample variance is 4.2 minutes^2”

“4. An experiment involving n independent trials with success probability p

“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.”

Let X and Y be independent continuous random variables with common

Let X and Y be independent continuous random variables with common distribution function F and density f. Find the distribution function and the density of V = max(X,Y ). Do the same for U = min(X,Y).

Let X have the uniform distribution on [0,1]. For what function

Let X have the uniform distribution on [0,1]. For what function g does Y = g(X) have the exponential distribution with parameter 1?

Let Y = e^X where X has the N(0,1) distribution. Find

Let Y = e^X where X has the N(0,1) distribution. Find the density of function of Y.

If the average low temperature of a winter month in Rochester,

If the average low temperature of a winter month in Rochester, NY is and the standard deviation is , then according to Chebyshev’s theorem, the percentage of averages low temperatures in Rochester, NY between and is _____%>?

A company produces two sizes of wallets from a material. The

A company produces two sizes of wallets from a material. The first requires 60 sq. inches of material and the second requires 100 square inches. The company has 1,000 sq. feet of material. what is the model?

I am totally confused on this following problem and am not

I am totally confused on this following problem and am not sure how to get the answer with the datat provided. The question is: The data for a completely randomized design with 2 treatments are shown in the accompanying table. Treatment 1 Treatment 2 10 12 7 8 8 13 11 10 10 10 9 11 9 A. Give the linear model appropriate for analyzing the data using regression. B. Fit the model, part A. to the data and conduct the analysis.

Your question: A sample of n=25 individuals is randomly selected from

Your question: A sample of n=25 individuals is randomly selected from a population with a mean of u=65, and a treatment is administered to the individuals in the sample. After treatment, the sample mean is found to be M=70. a. If the sample standard deviation is s=10, are the data sufficient to conclude that the treatment has a significant effect using a two-tailed test with a critical value of .05? b. If the sample standard deviation is s=20, are the data sufficient to conclude that the treatment has a significant effect using a two-tailed test with a critical value or .05?

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