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A problem with a telephone line that prevents a customer from receiving or making calls is upsetting to both the customer and the telephone company. The Excel file Phone (posted) contains samples of 20 problems reported to two different offices of a telephone company and the time to clear these problems (in minutes) from the customers' lines.
a) Assuming the population variances from both offices are equal, is there evidence of a difference in the mean waiting time between the two offices? Use α = 0.05.
b) What is the p-value?
c) Assuming that the population variances from both offices are equal, construct a 95% confidence interval estimate of the difference between the population means in the two offices.
Is the Euro fair? Soon after the Euro was introduced as currency in Europe, it was widely reported that someone had spun a Euro coin 250 times and gotten heads 140 times. We wish to test a hypothesis about the fairness of spinning the coin.
A basketball player has a history of making 75% of the foul shots taken during games. The player gets two shots at the foul line.
Determine the probability that exactly 8 of them started smoking before 18 years of age.
The National Turkey Association wants to experiment with three different feed mixtures for very young turkeys. Since no experience exists regarding the three mixtures, no assumptions can be made about the distribution of weights.
Suppose that weights of bags of potato chips coming from a factory follow a normal distribution with mean 12.8 ounces and standard deviation .6 ounces.
The State Department of education requires local school districts to keep records on all students within their district. Determine if the following items are categorical or numeric variables.
Using the data in the Excel file Home Market Value, develop a multiple linear regression model for estimating the market value as a function of both the age and size of the house.
Based on past data, the Student Recreation Center knew that the proportion of students who prefer exercising outside over exercising in a gym was 0.734. To update their records, the SRC conducted a survey. Out of 95 students surveyed, 76 indicated..
Find the mean and standard deviation for the population and population of exam scores
Using a 1% level of significance, can the hypothesis that the distributions for the student's scores are identical be accepted?
Advertisers need to know which age groups are likely to see their ads. Purchasers of 120 copies of Cosmopolitan are shown by age group, (a) Make a bar chart and describe it. (b) Calculate expected frequencies for each class.
The student body of a large university comprises 60% female students. Elucidate what is the probability that the students in the sample exactly two are female?
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