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The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed, with a mean of 3 minutes and a standard deviation of 1 minute. The quality-assurance department found in a sample of 50 customers at the Warren Road MacBurger that the mean waiting time was 2.75 minutes. At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
How does bell-shaped curve for sampling distribution of sample means for samples of size n =120 compare tobell-shaped curve for sampling distribution of sample means for samples of size n =95?
Verify value of t for the independent Variable, using formula. (That is, using formula in the Formula Sheet compute the t statistic , given data provided in the print out).
If one item is chosen at random, determine these probabilities. It is a TV
Compute z values for each and comment on your findings.
Find the area under the normal distribution curve to the right of z = -1.03.
Determine the probability that no more than 10 firms are perfectly competitive?
Make a List of type of possible errors. Assume that you were interested in knowing the mean score for a certain quiz in a statistics class.
Gigi has rolled a natural on four straight tosses of the dice. This excites the gamblers standing around the table.
Use the study to estimate the risk of an air bag fatality on a child seated on the front passenger seat.
Construct a 96 percent confidence interval for the mean weight of all firefighters six months after the exercise rooms were installed.
To find weighted aggregate price index using Laspeyres and Paasche method.
At the .05 significance level, can we conclude that the guideline is still reasonable?
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