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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?
Generate a relative frequency histogram using ten-point intervals to show the distribution of the scores.
In an analysis of variance problem involving 3 treatments and 10 observations per treatment, SSE = 399.6. The MSE for this situation is:
For monthly volume of 300 tables, find out total cost, total revenue and profit.
Dunn Poitiac has compiled the following sales data regarding the number of cars sold over the past 60n selling days. Answer the following questions for the sales data shown.
Determine if there is a linear correlation between annual income and the amount of insurance? What is the linear regression line for this data?
Suppose the assembly times follow normal distribution. Find out z values for 29 and 34 hours. What percent of garages take between 32 hours and 34 hours to erect?
If the sample standard deviation of the sample was $630 also the sample size was 50. Findout the 90% confidence interval of true mean.
Create a 98 percent confidence interval for the population mean.
Determine the probability of exactly one success given Poisson distribution with mean of 2.0.
At 0.01 level of significance, is there evidence that mean price is higher at Whole Foods Market than at Fairyway supermarket? Interpret the meaning of p-value in (i).
Consider the following estimated regression equation, based on 10 observations.
The coffee/soup machine at the local bus station is supposed to fill cups with 6 ounces of soup. Ten cups of soup are brought with results of a mean of 5.93 ounces and a standard deviation of 0.13 ounces. Construct a 99% confidence interval for th..
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