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The security department of a state university is planning its budget for the next year. In estimating the man-hours for security during university sponsored music concerts, the average length of music concerts is needed. A random sample from thirty-six security departments at universities was taken and the sample mean length of concerts was 160 minutes. Suppose the population standard deviation is 45 minutes. A 95 percent confidence interval for the true mean duration of music concerts is for this one I came up with 2 solutions 147.63 to 172.37 and when doing it over to check i got 145.3 to 174.7
Your workplace reduces all workplace scores on particular employee aptitude test in z-scores which are placed in district-wide distribution of scores.
Do these scores suggest that the different foods are differentially preferred by people in general? (Use the .05 significance level.)
Many educators feel their grades should fit a normal distribution and often apply curves to make them fit one. One way to do this is to convert numeric grades to z scores using the mean and standard deviation for the grades, then use an equation s..
We will test to determine if there evidence of an improvement on the final examination, at the 1% significance level. What is the alternate hypothesis?
Write the null and alternative hypotheses for testing if participants and non-participants differ in level of problem behavior (Y).
Is there a significant difference in sales dollars of hats between the west side and east side stores at the 5 percent level of significance? (a) State the hypotheses. (b) State the decision rule and sketch it. (c) Find the test statistic and stat..
Which of the variables below do you think will be roughly normally distributed? Please select all that apply.
Automobile manufacturers are interested in the difference in reaction times for drivers reacting to traditional incadescent lights and to LED lights.
Determine pearsons correlation coefficient and comment on the value obtained. Obtain a regression equation representing the above data. Estimate the production batch size for a direct labour cost of R350-00.
Why do we do power calculations with single sample z test? A) Because we can use Z area tables to calculate the power. B) Because comparing a sample mean against a population mean is very powerful
The analysis of covariance (ANCOVA) is generally useful for _______________
A study of 20 worldwide financial institutions showed the correlation between their assets and pretax profit to be .86. At the .05 significance level
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