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You are interested to know if your shop in the suburbs has customers of the same age as your shop in the center of the city. Statistics of customer ages are: Suburbs: X= 38, s = 3.5, n = 19 City Center: 5Z- = 42, s = 4.0 , n = 24
a. Calculate the pooled variance.
b. Test if the ages are same or different using the Z or t test, a = 0.05.
Discuss some of the common uses of IQ tests. Do you think that IQ test should be used for these purpose? Does the Flynn effect alter your thoughts about the uses of IQ test? Explain.
At the .01 significance level can we (she) conclude that the true average daily amount of tips is greater than $80? yes or no.....
The diameter of small Nerf balls manufactured at a factory in China is expected to be approximately normally distributed with a mean of 5.2 inches and a standard deviation of .08 inch. Suppose a random sample of 20 balls is selected. Find the inte..
When would you use a two population test with a small sample size at your place of employment, in your education, or in politics?
A recent article in the Myrtle Beach Sun Times reported that the mean labor cost to repair a colour television is $90 with a standard deviation of $22. Monte's TV Sales and Service completed repairs on two sets this morning. The labor cost for the..
1. if a population mean is 300 and the sample mean is 400 the difference of 100 is calleda.standard errorb.sampling
the weight of a sophisticated running shoe is normally distributed with a mean of 12 ounces and a standard deviation of
Suppose that the probability distribution of a random variable x can be described by the formula. Calculate the variance and standard deviation.
A random sample of 52 groups gave a mean of $8.30 with a standard deviation of $2.42. Find a 90% confidence interval for the mean amount left by all groups.
Scores on a test are normally distributed with a mean of 60.9 and a standard deviation of 12. Find P81, which separates the bottom 81% from the top 19%.
1. two manufacturing plants produce similar parts. plant 1 produces 1000 parts 100 of which are defective. plant 2
Many educators feel their grades should fit a normal distribution and often apply curves to make them fit one. One way to do this is to convert numeric grades to z scores using the mean and standard deviation for the grades, then use an equation s..
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