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A recent article in Vitality magazine reported that the mean amount of leisure time per week for American men is 40 hours. You believe this figure is too large and decide to conduct your own test. In a random sample of 60 men, you find that the mean is 37.8 hours of leisure per week and that the standard deviation of the sample is 12.2 hours. Can you conclude that the information in the article is untrue? Use the 0.05 significance level. Determine the p-value and explain its meaning.
The main purpose of this exercise is to check your understanding of significance level, p-values and power .
Find the probability that a randomly selected teacher earns and what sample size is necessary to double the standard error of the mean and what sample size is needed to cut the standard error of the mean in half?
FBI Report Do greater universities tend to have more property crime, would you speek that the correlation is low, moderate or high
An economist is interested in studying the spending habits of consumers in a particular region. The population variance is known to be $1,000,000. A random sample of 50 individuals resulted in an average expense of $15,000. What is the width of th..
Spinning a coin, unlike tossing it, may not give heads and tails equal probabilities. I spun a penny 200 times and got 83 heads. How significant is this evidence against equal probabilities?
Discuss why sampling is essential to many research designs, and why, if done correctly may be more accurate than attempting census measurement.
Develop four probability questions using the table that you as an instructor of statistics might ask a class of students for a test in probability.
What is the probability that a randomly selected automobile manufactured by the company will have a defective microprocessor?
For the first test, assume the data are from an independent-measures study using two separate samples.
Can one conclude at a level of significance of .01 that the new ball has improved his game?
Which combination of factors produces smallest risk of Type I error?
Find the probability of winning jackpot?
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