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The number of sit-ups that a person can do in one minute, both before and after a physical fitness course was recorded. The data is shown below for 10 randomly selected participants.
Is there sufficient evidence to conclude that a significant amount of improvement took place? Assume variable is normally distributed. Test using alpha = 0.01.
Before 30 23 25 29 27 25 30 45 34 26
After 31 27 25 35 34 35 32 52 50 43
Is the gender distribution for theater goers significantly different from the distribution for the general college? Test at the .05 level of significance.
Explain the importance of random sampling. What problems/limitations could prevent a truly random sampling and how can they be prevented?
How might one know if an error was made in accepting or rejecting the null hypothesis? Do you suppose the nature of the research has an influence on the selection of the significance level? Why or why not?
What does the coefficient of determination tell you about the variation attendance and the variation in the number of exhibitors?
Assume rivets are defective independently of one another, each with the same probability. If 24% of all seams need reworking, determine the probability that rivet is defective?
The progress report of a research analyst to the supervisor stated: "All the estimated regression coefficients in our model with three predictor variables to predict sales are statistically significant.
What assumption must you make about the population distribution in order to construct the confidence interval estimate in (a)?
A random sample of size 70 is drawn from population. Determine probability that mean annual salary is between $32,000 and $32,500?
The Swansons are planning to fly to Hawaii from Toronto with a stopover in Los Angeles. There are five flights they can take between Toronto and Los Angeles and ten flights between Los Angeles and Hawaii.
In order to control costs, a company wishes to study the amount of money its sales force spends entertaining clients. The following is a random sample of six entertainment expenses (dinner costs for four people) from expense reports submitted by m..
What is your conclusion? Are the two variables independent?
Some of the factors affect statistical power for a one sample t test. How does statistical power change (increase or decrease) for each of the following changes?
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