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In a particular February, the mean cost for an airline round-trip with a discount fare was $258. A random sample of 15 round-trip discount fares during the month of March provided the following data:
310 260 265 255 300 310 230 250 265 280 290 240 285 250 260
a. Using α = .05, test to see whether the mean round-trip discount fare has increase in March. What is your conclusion?
b. What is the p-value?
A random sample of 12 paired observations indicated a correlation of .32. Can we conclude that the correlation in the population is greater than zero? Use the .05 significance level.
Black Hole Pizza Parlor instructs its cooks to put a "handful" of cheese on each large pizza. A random sample of six such handfuls were weighed.
Critically illustrate out the limitations of seasonal forecasting? Provide examples.
Test claim that mean responses are same for all populations of patients receiving either treatment and of either gender.
The population of lengths of aluminium coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.20 inches. A sample of four metal sheets is randomly selected from a batch. What is the possibility that t..
Can you provide an example using your own data set (two related and unrelated variables) of at least twenty numbers each and apply the formula of correlation. Determine the correlation of each of the two sets of data.
In an analysis of variance summary table, if the mean square between = 35 and the mean square within = 28, then the null hypothesis of the groups having the same mean is?
A firm engaged in manufacturing undergarments for gents employs 100 male and 144 female workers. The average production per day of a male worker is 60 items with a variance of 15 items, and that of a female workers is 65 items with a variance of 1..
A PC manufacturer claims that no more than 2% of their machines are defective. In a random sample of 100 machines, it is found that 5% are defective. The manufacturer claims this is a fluke of the sample.
You are the owner of a small casino in Las Vegas. You want to reward high rollers who come to your casino. You want to give free accomodations to no more than 10% of your patrons. Suppose that the mean amount wagered by all patrons is $287 with a ..
For the data shown below, prepare a x-bar chart. Note that the sample size is three. Record the values for the UCL, center line, and LCL. In addition, note any points that are out of control.
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?
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