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Aa certain university the mean income of parents of the entering class is reported to be $91,600. The president of another university feels that the parents'income for her entering class is greater than $91,600. She surveys 100 randomly selected families and finds the mean income to be $96,321 with a standard deviation of $9555.With a0.05, is she correct?
f x has a normal distribution with mean µ=15 and standard deviation σ= 3, describe the distribution of x values for sample size n, where n = 4, n = 16, and n = 100. How do the x distributions compare for the various sample sizes?
In the case of Castenedav. Partida, it was found that during a period of 11 years in Hilda County, Texas, 870 people were selected for grand jury duty, and 39% of them were Americans of Mexican ancestry.
A research firm wants to compare the miles per gallon of unleaded regular, mid-grade, and super grades of gasoline. They drive the same car under approximately similar driving conditions and changing out the type of gasoline used.
If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, what percentage of light bulbs have a life less than 2500 hours?
Given the Life expectancy data for the countries of the E.U., can we conclude that the mean Life Expectancy in the U.S. is greater than the mean Life expectancy in the E.U.?
What is an appropriate sample space for this experiment?
A new president at Big State University has made student satisfaction with the enrollment and registrations process one of her highest priorities.
At the 5% level of significance, does this result support the conjecture?
Assume that a 2005 poll of 1000 American voters found that 76% of Republicans favored ending the tax on dividend income, as did 42% of Democrats and 54% of Independents.
Interpret the correlation between each set of variables.
Provide an example of a hypothesis test you could perform at work or at home. State what the Null and the Alternative hypotheses would be in your test.
Compute the skewness for your data set using Pearson's
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