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Suppose you interview 10 randomly selected workers and ask how many miles they commute to work. You'll compute the sample mean commute distance. Now imagine repeating the survey many, many times, each time recording a different sample mean commute distance. In the long run, a histogram of these sample means represents
a. the bias, if any, that is present in the sampling method.
b. the sampling distribution of the sample mean
c. the true population average commute distance
d. a simple random sample.
In the Florida lottery, six numbers from 1 to 53 must be selected. to win the jackpot, the six numbers must match the draw numbers.
Perform a test to determine whether there is sufficient evidence to support a claim of a linear correlation between two variables. Find the critical values of r given the number of pairs of data n and the significance level alpha.
Jim Sears manufactures farm equipment. His work requires the use of steel bars which must have a mean length of at least 50 inches. The bars can be purchased from a supplier in Kansas
At the .05 significance level, can we conclude that the guideline is still reasonable?
Fit a multiple linear regression model for predicting the hospital duration using age, sex, body temperature, white blood cell counts, antibiotic use, blood culture and service
Frequently, tests that yield abnormal results are repeated for confirmation. What is the probability that for a normal person a test will be at least 1.5 times as high as the upper limit of normal on two separate occasions?
Evaluate the significance of the hypothesis that the randomized algorithm has a lower average runtime than the known comparison algorithm. As before, explain and list your calculations, test choices, and conclusion drawn.
Write a brief summary of the distribution of the area of homes.
What is the probability the average of the sample is more than $38000 and What is the standard deviation of the sample mean
The study was done to distinguish people's religion with how many days that they have said they have been calm in past three days. Determine proportion of Catholics were calm for 1 out of 3 days?
A trucking firm suspects that the mean lifetime of a certain tire it uses is less than 35000 miles. To check the claim the firm randomly selects and test 54 of these tires and gets a mean lifetime of 34,570
Many times researchers preselect the value of alpha of .01 or .001. What are the factors that allow selection of either of those levels of significance?
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