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A random group of apartments was selected from a city to analyze the number of bedrooms they have. Is there evidence to reject the hypothesis that the apartments are equally distributed between 1-bedroom, 2-bedroom, and 3-bedroom apartments, at alpha = .05?
Year in school1 bedroom2 bedrooms3 bedroomsNumber of students11 9 14
If the shop does not want to give more than 1% of its customers a free lube and oil change service, how long should the guarantee be?
A statistics instructor collected data on the time it takes the students to complete a test. The test taking time is uniformly distributed within a range of 35 minutes to 55 minutes.
Standard deviation was increased to 40, determine the overall effect on their society? Would this change be a good thing?
Privacy Are your finances, buying habits, medical records, and phone calls really private? A real concern for many adults is that computers and Internet are reducing privacy. A survey conducted by Peter D.
At the .05 significance level, can the developer conclude there is a difference in the mean income? Use the five-step hypothesis testing procedure.
Assume that random variables X1,.....,X50 are independent and all have probability density function fX(x) = 1/x for 1
When investigating the distribution of a data set, which is more effective: a frequency distribution or a histogram? Why?
Based on these results a confidence interval extending from 5.96 to 6.16 was calculated for the population mean. Find the confidence level of this interval.
Explain and show exactly how you are getting the correct information from your data set and how you are computing the probabilty.
What shape curve do you get when your data set has the mean, median, and mode all with the same value? Could the value of the sample mean and the value of the population mean ever be the same?
Caselet on McDonald’s vs. Burger King - Waiting time
Using the z table in Table E of Appendix C, determine the critical value for the hightailed test with a = 0.035.
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