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A major department store chain is interested in estimating the average amount its credit card customers spent on their first visit to the chain's new store in the mall. Fifteen credit card accounts were randomly sampled and analyzed with the following results: Χ = $50.50 and s2 = 400. Assuming the distribution of the amount spent on their first visit is approximately normal, what is the shape of the sampling distribution of the sample mean that will be used to create the desired confidence interval for μ?
At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students? Compute the value of the test statistic.
A company will promote two employees out of a group of six men and three women, what would you say the chances of this experiment if there is particular concern about gender equity and which concept of probability would you use to estimate these p..
Determine the probability of receiving at most three calls in a five-minute interval of time. Determine the probability of receiving exactly 10 calls in 15 minutes.
The singer has the following variety of songs, in no particular order: 7 relationship songs, 6 songs about people, 4 reflective songs, and 4 songs about places.
Classifcation Which of the following are continuous variables and which are discrete?
Calculate the correlation coefficient and prediction equation.
In the year 2006 the mean fare to fly from Charlotte, North Carolina, to Seattle, Washington, on a discount ticket was $267. A random sample of round-trip discount fares on this route last month gives:
Explain in words general pattern of correlation is statistically important.
A 95% confidence interval for the proportion of all adults who bought a lottery ticket in the past year is (assume Gallup used an SRS)
The following data represent glucose blood levels(mg/100ml) after a 12 hour fast for random sample of 70 women: Employ 6 classes and make a frequency distribution table.
Given a normal distribution with a population mean of 100, a standard deviation of 10 and a sample size of n = 25, what is the probability that X is
Recognize and describe potential threats (up to 3) to internal validity.
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