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If a correlation coeficiant calculated for n=14 and a=0.01 is found to be r=.0856 what is the test value for the t-test?
The first three digits of a university telphone exchange are 452. if all the sequences of the remaining four digits are equally likely, what is the probability that a randomly selected universtiy phone number contains seven distinct digits?
Consider that you are a line manager in your current Corporation. There is a0.50 probability that you will be promoted this year. There is a 0.65 probability thatyou will get a promotion or a raise. The probability of getting a promotion and a raisei..
Normal distribution with mean 1,200 hours, and standard deviation 70 hours. Determine the probability the mean life time of a random sample of 9 bulbs will be At least 1,180 hours.
An automobile assembly line operation has a scheduled mean completion time,u , of 13.5 minutes. The standard deviation of completion times is 1.7 minutes.
zingos grocery store claims that customers spend an average of five minutes waiting for service at the stores deli
a metropolitan school system consists of three school districts-norths south central. the north district contains 25 of
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.
question 1 a pizza shop owner wishes to find the 95 confidence interval of the true mean cost of a large pizza. how
the study obtained a measure to determine how comfortable the shopper was in a store. Higher scores indicated greater comfort. Suppose the following data were collected. Use a = .05 to test for differences among comfort levels for three types of b..
The company sells lawnmowers for $895 each. The variable cost per lawnmower is $520. The company's monthly fixed costs are $84,500.
Calculate the standard deviation of the sample mean for samples of size 1, 4, 25, 100, 250, 500, 1000, and 5000. Graph your results with the sample size on the x axis and the standard deviation on the y axis.
Which test should we use to determine whether the difference between Mesa and Tempe is statistically significant? Why? Should it be one or two-tailed?
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