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Survey of students. A survey of students in an introductory statistics class asked the following questions: (a) What is your age in years? (b) Do you like to dance (yes, no)? (c) Can you play a musical instrument (not at all, a little, pretty well)? (d) How much did you spend on food last week? (e) What is your height in inches? (f) Do you like broccoli (yes, no)? Classify each of these variables as categorical or quantitative and give reasons for your answers.
At the 1% level, can you conclude that the percentage of Independents who stated that the news was mostly bad was significantly different from.
(More doughnut shop adventures) Suddenly you remember that your best friend desperately wants a cake doughnut.
Obtain a test statistic and p-value. Interpret the results. (c) Is normality assured? (d) Is the difference large enough to be important?
The sample yielded a mean content of 11.88 ounces, with a standard deviation of 0.24 ounces. Use a 0.05 level of significance and test to see if the machine is in perfect adjustment (perform all six steps of hypothesis testing, including p-values)..
Consider the following results for two samples randomly taken from two populations. Construct a 99 percent confidence interval estimate of the difference between the two sample means.
Based on the research of Ibbotson Associates, a Chicago investment firm, and Prof. Jeremy Siegel of the Wharton School of the University of Pennsylvania.
A snack company distributes chips in bags labeled 6 ounces. The local Bureau of Weights and Measures randomly selects 50 bags of chips and obtains a sample mean of 5.9 ounces.
If you roll a die 40 times and 9 of the rolls result in a "5", what empirical probability was observed for the event
A computer solitaire game uses a standard 52-card deck and randomly shuffles the cards for play. Theoretically, it should be possible to find optimal strategies
Standard deviation of 424 and 155 respectively. at the .05 level of significance, test the claim that the new version has standard deviation equal to that of the past version.
a clinical trial is run to investigate the effectiveness of an experimental drug in reducing preterm delivery to a drug
Using the data of Exercise 129, show that the class marks also are given by the midpoint between successive class boundaries (a) Construct a histogram of the drying times of polyurethane from the data in Exercise 115.
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