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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.
Determine the probability that of a Type I error using decision rule if population mean is in fact 800 kilowatts per day?
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A box contains 10 chips. The chips are numbered 1 through 10. Otherwise, the chips are identical. From this box, we draw one chip at random, and record its value.
Create a 98 percent confidence interval for the population mean.
The analysis of covariance (ANCOVA) is generally useful for _______________
A standard IQ test has mean of 98 and a standard deviation of 16. We want to be 99% certain that we are 8 IQ points of the true mean. Determine the sample size.
Let's suppose that we have 2 variables year and age.. I use STATA to make them into dummy variables as follows:
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A researcher wanted to determine the mean number of hours per week (Sunday through Saturday) the typical person watches television. Results from the Sullivan Statistics Survey indicate that s=7.5 hours
Would the null hypothesis that the 2007 median household income was $50,000 be rejected at the 10% significance level in favor of the two-sided alternative? (Choose the correct answer)
The Dean of Students believes that the costs are greater this semester. What is the test value for this hypothesis?
You are running a chi-squared test. You have 2 groups with 3 characteristics each, what would your critical value be with an alpha of .025?
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