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Assume that I have a variable with a sample mean = 10, and sample n = 50. And let's say that the population standard deviation for the variable = 3. How would I create a 95% confidence interval around the sample mean based on this information?
A student team examined parked cars in four different suburban shopping malls. One hundred vehicles were examined in each location. Research question: At α = . 05, does vehicle type vary by mall location?
A check of dorm rooms on a large college campuses revealed that 38% had refrigerators, 52 percent had TVs and 21 percent had both a TV and a refrigerator. What's the probability that a randomly selected dorm room has.
The mean monthly rent for a random sample of 10 apartments advertised in the local newspaper is $640. Assume that the standard deviation is $90. find a 95% confidence interval for the mean monthly rent for unfurnished one-bedroom apartments ..
a statistics class consists of 24 students all but one of whom are unemployed or are employed in low paying part time
q1. consider an investment portfolio of 50000 in stock a and 50000 in stock b. the expected value of a is 9.5 and b is
Compute the probability that student eats at fast food restaurant 2 or more times per week?
random sampling from four treatments produced the following
The 1996 GSS asked, "If husband in family wants children, but wife makes decision that she doesn't want any children. If standard error is 0.01429, determine the 96 % confidence interval for population proportion who would say yes.
question the glen valley steel company manufactures steel bars. if the production process is workingproperly it turns
if sample data result in a linear correlation coefficient of r 0.400 what proportion of the variation in y is
What is the probability that the dample mean grade point average will be either less than 2.709 or more than 2.955.
We have no knowledge about whether waiting times follow a normal distribution. Why is it nevertheless appropriate to use inference methods which rely on the assumption of normality? Construct a 97% confidence interval for the true mean emergency wa..
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