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A computer manufacturer is introducing a new product specifically targeted at the home market and wishes to compare the effectiveness of three sales strategies: computer stores, home electronics sto
Give a point estimate of the mean value of the parts inventory. (round to the nearest cent) Find the estimated standard error of the point estimate of part a. (round to nearest cent)
What is the maximum value that the standard error of the sampling distribution of the sample proportion could have?
If the joint distribution is a bivariate normal with p=0.4, find the probability that a student has a Math SAT above 600, given that her G.p.a. is 3.5.
A passenger arrives at the stop at a time that is uniformly distributed between 7:00 a.m. and 7:30 a.m. (X refers to the number of minutes past 7 a.m., and X is uniformly distributed over the inter
Suppose N=90,000, n=18,000, s=50. Compute the standard error of xbar using the finite population correction factor.
Test the claim using a hypothesis test (show all work) Test the claim by constructing an appropriate confidence interval (show all work)
If you wish to estimate a population mean with a sampling distribution error SE=0.24 using a 95% confidence interval and you know from prior sampling that is approximately equal to 7.9, how many obs
Assuming a near normal distribution what are the mean and standard deviation of the sample mean of these quality checks? A recent sample of five wafers yielded a sample mean of 10.4 mm. Find the prob
We have random variables: Ybar (sample mean) and W (the sample variance) for the sample size of n=2 from the distriubiton:
What type of data would necessitate using a hypothesis test of the population proportion rather than a test of the population mean?
Compute the probability mass function for X. Compute the expected value E(X). Compute the variance V(X).
Calls to a customer service center last on average 1.8 minutes with a standard deviation of 1.5 minutes. An operator in the call center is required to answer 94 calls each day. Assume the call times
One environmental group did a study of recycling habits in a California community. It found that 72% of the aluminum cans sold in the area were recycled. (Round your answers to four decimal places.)
For each of the following statements, give the null hypothesis (Ho), and the alternate hypothesis (H1).
In a large American university in 1969, the male and female professors were sample independently, yielding the following annual salaries (in thousand of dollars):
A machine fills cans of soda which are labeled "12 ounces" according to a normal distribution with mean 12.1 ounces and standard deviation 0.1 ounces. If I buy a 12-pack of the soda, what is the sta
What is a research question that you would like to answer? Write the null and research hypotheses. Would you use a one- or two-tailed test? Why?
A trucking firm delivers appliances for a large retail operation. The packages (or crates) have a mean weight of 298 lb. and a variance of 2704. (Give your answers correct to four decimal places.)
One of the requirements of a probability distribution is that the sum of the probabilities must be 1 (with a small amount of leeway alowed for rounding errors). what is the justification for this re
The mean clotting time of blood is 7.35 seconds, with a standard deviation of 0.35 seconds. What is the probability that blood clotting time will be less than 7 seconds?
Blair is almost sure that his monthly costs for the past year are not representative of his average monthly costs over the past 20 years.
The mean healing time for these subjects is days. We will assume that the standard deviation is days. So, with a significance level of .05, can we conclude that the population mean (for those treate
What do we mean when we say that a statistical result is significant? What is the difference between a statistically significant and a meaningful result? Why is statistical significance important?