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The mean and the standard deviation of the sample of 100 bank customer waiting times in Table 1.8 are (xbar=5.49) and s=2.317. Calculate a t-based 95 percent confidence interval for U, the mean of all possible bank customer waiting times using the new system. Are we 95 percent confident that U is less than six minutes? (Choose the nearest degree of freedom for the given sample size. Round your answers to 3 decimal places.)
A doctorhas developed an experimental drug for toe-nail fungus. He needs to test it out on some people to make sure it works. He has a list of 2000 people who could be potential subjects in his study. 1120 of these potential subjects have toe ..
A newspaper finds that the mean number of typographical errors per page is five. Find the probability that:
brees inc. has current assets of 7500 net fixed assets of 28900 current liabilities of 5900 and long-term debt of
Can Mr. Rutter conclude that the mean weight of the bags is less than 50 pounds? Use the 0.1 significance level. In a brief report, tell why Mr. Rutter can use the z distribution as the test statistic.
The weight of cans of fruit is normally distributed with a mean of 1,000 grams and a standard deviation of 50 grams. What percent of the cans weigh 860 grams or less?
You have been asked to analyse Grand Plomp Ltd, a maker of rocket widgets used by NASA. The owners are wondering whether the return received is sufficient to justify the risks taken in each division.
A population has a mean of 80 and a standard deviation of 7. A sample of 49 observations will be taken. The probability that the sample mean will be larger than 82 is?
Conduct a two-tailed hypothesis test given the information below. Assuming that the population variances are equal for male and female Grade Point Averages (GPAs), use the following sample data to test.
Create a 95% confidence interval for the population mean days absent for sickness based on this sample. Select the answer closest to your results.
The standard deviation of their rents is $80. (a) What is the standard error of the mean? (b) What are the degrees of freedom for a one-sample t statistic?
If 25 loads are chosen at random for a weight check, find the probability that the mean weight of those loads is less than 44.24 tons. Assume that the variable is normally distributed.
computing the mean and standard deviation for the given data.1.a population of scores has micro 50 and s 12. if you
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