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The city manager of Tempe has received a complaint from the local union of firefighters stating they are underpaid. Not having much time, the city manager gathers records from a random sample of 20 firefighters and finds their average annual salary is $36,025 with a standard deviation of $575. If the city manager knows the average salary nationally is $38,300, which test of significance should be used? Why? Should it be one or two-tailed?
Find a 96% confidence interval for the true percentage of all households that have central air conditioning. Write a sentence that interprets this interval.
Given this information, what would sampling error be if sample including seven values in top row were used to calculate sample mean?
Construct the following confidence intervals for your data set:
Answer all of these questions using R Commander. Include all graphs, outputs from R Commander.
No, there is not enough information to refuse hypothesis that proportion of male students who live on campus and proportion of female students who live on campus are same as the test value -1.65 is inside acceptance region (-1.96,1.96).
What decision should be made regarding the null hypothesis?
How many units of capacity should be built to minimize the total cost of providing capacity plus lost sales?
In a normal frequency distribution, 32% of the cases:
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..
You know that all sociology majors study 2.5 hours per day with a standard deviation of 1.
Carry out an ANOVA and describe in detail in a BPS-formatted Results section:
The average age of the students in the sample was 23 with a standard deviation of 3.5: a) Formulate the hypotheses for this problem.
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