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You are a new manager at al lowbucks coffee shop. Your workers are already complaining! They want you to hire more help. They claim that they are having to make at least 200 cups of coffee an hour. You doubt that, so you take a sample over a few hours and find that over a four hour period one Friday afternoon, the workers averaged 191 cups of coffee per hour, with a standard deviation of 6 cups. Using a significance level of 0.05, perform a hypothesis test to see if the workers are right, and you need to hire more help. Write your hypotheses, calculate your test statistic and decide whether or not to reject your null.
a) Do a test to see if workers attitudes on this matter have changed using a 90% alpha. b) Explain to management what your findings are and what this suggests about future decisions vs work options.
To evaluate average annual expenses of students on books and class materials sample size 36 is taken.
Assuming that all other variables are held constant, explain how the value of z influenced by each of the following:
To give 98% confidence interval for population mean μ, you would use critical value.
How many students should be surveyed if a 90% confidence interval is desired and the margin of error is to be only 3%?
If measurements are made over span of 9 months, and results are averaged, find out the probability that neighbourhood is considered unsafe?
Calculate the appropriate test statistic to test the hypotheses related to the concern and test at 5% and 1%.
An experiment was carried out to assess the effects of four tomato varieties and four planting densities on yield. There were 64 plots, and each of the 16 factor combinations was randomly assigned to 4 plots
Illustrate the regression model and predict it. The following table shows the yearly maintenance costs for several cars, as well as their age.
Find the probability of winning jackpot?
Of the nine members of the board of trustees of a college, five agree with president on a certain issue. The president selects three trustees at random and asks for their opinions. What is the probability that at least two of them would agree with..
Determine a 99% confidence interval for mean pH in rainfall. How would you distinguish interval?
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