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Sixto Sanchez is the owner of Suburban Stylists. He is evaluating the service level provided to walk-in customers. Because he is enrolled in an MBA program at Eastern University, Sixto decides to sample walk-in customers for the next two weeks. He collects information from 82 walk-in customers and calculates that their average waiting times that is 21 minutes with a standard deviation of 4 minutes.
a) Determine the degrees of freedom to be used in further analysis.
b) Calculate the two sided 95% confidence interval for the population mean of waiting times.
c) Calculate the two sided 90% confidence interval for the population mean of waiting times.
d) Calculate the two sided 99% confidence interval for the population mean of waiting times
e) What t table value should be used in calculating a two sided 95% confidence interval for the population mean of waiting times if the sample selected is 25 instead of 82?
The outlier seen in the residuals plot is a crossing by Vicki Keith in 1987 in which she swam a round trip, North to South and then back again. Clearly, this swim doesn't belong with the others. Do you think that removing it would change the model..
Describe sample space for selecting a single person. - If you select three people, describe the sample space.- define the sample space for the random variable that expresses the number of Twitter users in the sample of size 3.
On the basis of this information, can we conclude that a vegetarian diet causes lower death rates from heart attacks and cancer? Explain.
(a) In an attempt to determine if students prefer bottled water to tap water, you set up a table in the cafeteria at lunchtime and have students sample some of each and ask them which they prefer. (b) Researchers collect data over 15 years about 10..
Data are recorded on effects of each drug. Is research division by using dependent or independent samples? Explain why?
State the null and alternative hypotheses in terms of the treatment effects, then use the 0.025 level of significance in reaching a conclusion regarding the null hypothesis.
Find the 93% confidence interval of the true mean. If a day care center were starting up and wanted to keep tuition low, what would be a reasonable amount to charge?
What percentage of students will have scores exceeding 500?- What percentage of students will have scores between 600 and 700?
Using Coefficient of Variation determine in which year do the ages show a more dispersed distribution? Show your complete work and support your answer.
Assume that increasing and decreasing allergic reactions are equally likely if the training has no effect. Use alpha = .05
What is the probability both stocks appreciate during the period? What is the probability the bank stock appreciates but the utility does not? What is the probability at least one of the stocks appreciates?
A researcher computes the mean, the median, and the mode for a set of n = 50 responses to this question. Which of the following statements accurately describes the measures of central tendency?
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