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At the time she was hired as a server at the Grumney Family Restaurant, Beth Brigden was told, "You can average more than $80 a day in tips." Assume the standard deviation of the population distribution is $3.24. Over the first 35 days she was employed at the restaurant, the mean daily amount of her tips was $84.85. At the .01 significance level, can Ms. Brigden conclude that she is earning an average of more than $80 in tips?
A researcher wished to estimate the number of households with two cars. How large a sample is needed in order to be 95% confident that the sample proportion will not differ from the true proportion by more than 4%.
A sample of 100 observations has a mean of 2.99 and a standard deviation s equal to 0.5 Conduct the following test of hypotheses about the corresponding population mean at a level of significance of α = 0.2
If 25 men aged 18-24 are arbitrarily chosen, determine probability that their mean serum cholesterol level is between 165 and 200.
A campus researcher wanted to investigate the factors that affect visitor travel time in a complex. multilevel building on campus.
Explain the difference between a logarithm of a product and the product of logarithms and give examples of each.
She asks 10 people how many Standard Deviations songs they know. Her data are:
Once again, suppose that the standard deviation of the average or median is $5.00. Which is the probability that the average or median of the sample is greater than $22.50 but less than $25.00?
Use Bayes's rule to find the conditional probability that Julianne is a carrier, given that she and Jason have one child who does not have cystic fibrosis.
The manufacturer of an airport baggage scanning machine claims it can handle an average of 530 bags per hour.
Test the null hypothesis that the telephone survey technique has a probability of selecting a household with no children that is equal to the value obtained by the census.
Assume that each light bulb works independently of other light bulbs. Determine the probability that all 10 of light bulbs work?
A basketball player has a history of making 75% of the foul shots taken during games. The player gets two shots at the foul line.
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