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Question: Do women study more than men? We asked the students in a large first-year college class how many minutes they studied on a typical weeknight. Here are the responses of random samples of 30 women and 30 men from the class:
(a) Examine the data. Why are you not surprised that most responses are multiples of 10 minutes? Are there any responses you consider suspicious?
(b) Make a back-to-back stemplot to compare the two samples. Does it appear that women study more than men (or at least claim that they do)? Justify your answer.
A dependent samples t test is typically more powerful than an independent samples t test because? Reduces participant/subject variability between groups.
jeffs bowling scores are approximately normally distributed with mean 160 and standard deviation 13 while jacks scores
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a health researcher is interested in determining whether or not the speed at which people walk is related to their
in the article a multifactorial intervention program reduces the duration of delirium length of hospitalization and
In a bumper test, three types of autos were deliberately crashed into a barrier at 5 mph, and the resulting damage (in dollars) was estimated.
nurses wondered if birth weights of babies are going up. they knew that the average birth weight of a baby last year
Statistics Questions Set: If the mean number of hours of television watched by teenagers per week is 12 with a standard deviation of 2 hours, what proportion of teenagers watch 16 to 18 hours of TV a week? (Assume a normal distribution.)
TV ads. A start-up company is about to market a new computer printer. It decides to gamble by running commercials during the Super Bowl.
1. What should the newspaper do? Use appropriate test and state the assumption(s). 2. What is the P-value for the test you have conducted in part a?
a. How many of the individuals selected in your sample are female? b. How is the stratified sample different from the SRS?
What percentage of the personnel has a salary between $30,000 and $40,000 per year? What percentage of personnel will not exceed $45,000?
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