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A researcher is investigating the effectiveness of a new study-skills training program for elementary school children. A sample of n= 25 third grade children and each child is given a standardized achievement test at the end of the year. For the regular population of third grade children, scores on the test form a normal distribution with a mean of µ = 150 and a standard deviation of σ = 25. The mean for the sample is M = 158.
a. Sketch the appropriate distribution, and locate the critical regions for α = .05.
b. Calculate the test statistics (z score) for the sample.
c. What decision should be made about the effect of the program?
Super Cola Bottles soft drinks labeled "net weight 16 ounces." An overall process average of 16.01 ounces has been found by taking several batches of samples, in which each sample contained 5 bottles.
Determine mean and standard deviation for number of erroneous returns per batch.
Create a scatter plot for those data. Based on scatter plot, how would you explain relationship between the two variable.
What are the theoretical parameters for the sampling distribution based on these 40 trains? Assume you are dealing with an infinite population of trains.
The following payoff matrix has been developed for the decision problem. What is the opportunity loss when "A" is Investment alternative and "Decline" is state of nature?
A typical problem statement is correlation research is _____________
Assume you choose 20 houses at random. On average, how many houses of twenty would you expect to have DVD? Determine standard deviation of number of houses with DVD?
A professor wants to conduct a study to know whether the grades she gives to her students affect their evaluations of her. She teaches four classes of ten students each.
Assume that a sample is drawn and z(α/2) = 1.65 and σ = 35. Answer the following questions. (A) If the Maximum Error of Estimate is 0.04 for this sample, what would be the sample size?
A manager of a small store wanted to discourage shoplifters by putting signs around the store saying "Shoplifting is a crime!" However, he wanted to make sure this would not result in customers buying less.
The pooled variance of two samples is:
If the population mean was $1047 in the previous year, does the evidence suggest that expenditure this year has significantly changed?
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