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A new cream that advertises that it can reduce wrinkles and improve skin was subject to a recent study. A sample of 62 women over the age of 50 used the new cream for 6 months. Of those 62 women, 36 of them reported skin improvement(as judged by a dermatologist). Is this evidence that the cream will improve the skin of more than 60% of women over the age of 50? Test using α=0.01
(a) Test statistic: z=
(b) Critical Value: z=
Assuming a normal distribution of item values, what percentage of values would you expect to be out of bounds when the process is in control? Accordingly, how would you de?ne "too many"? What do you think is the rationale for this practice?
Ohio Company provided the following information regarding its only product--ice skates.
A researcher is analyzing a dataset to determine whether the independent variables predict students' reading level.
The bank wants to find out the waiting time of their customers during the Friday evening hours from 5pm to 8pm. Using the data in ungrouped form, compute the Standard Deviation, using the computational formula.
What percentage of the checkout times was less than 3 minutes? ? In what class interval must the median lie? Explain your answer.
Suppose that blood chloride concentration
Assuming that these numbers are exact and that the sample was randomly chosen from the entire population of interest, give a 90% con?dence interval for the proportion of ?lled MBA positions in Europe.
A sales analyst wants to determine whether there is a difference in the mean monthly sales of a company's four sales regions. Several salespersons from each region are randomly selected and each provides his or her sales amounts (in thousands of d..
consider the experiment of drawing two cards from a shuffled deck and then putting them back. what is the probability
For the passengers in the SRS, what is the approximate probability that the mean length of time for them to get through security will be less than 18 minutes?
a sample of n 16 scores has a mean of m 65 and an estimated standard error of 2 points. what is the sample
a) What is the level of significance? b) What is the value of the sample test statistic? (Round your answer to three decimal places.) c) Find the P-value. (Round your answer to four decimal places.)
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