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Suppose we would like to determine if the typical amount spent per customer for dinner at a new restaurant in town is more than $20.00. A sample of 49 customers over a three-week period was randomly selected and the average amount spent was $22.60. Assume that the standard deviation s is known to be $5.50. Using a 0.05 level of significance, would we conclude the typical amount spent per customer is more than $20.00?
the time needed to complete a final examination in a particular college course is normally distributed with a mean of
describe the circumstances under which the shape of the sampling distribution of p-hat is
Suppose a consumer product researcher wanted to find out whether a highlighter lasted less than the manufacturer's claim that their highlighters could write continuously for 14 hours. The researcher tested 40 highlighters and recorded the number o..
Prove that the probability of exactly n heads in 2n tosses of a fair coin is given by the product of the odd numbers up to 2n - 1 divided by the product of the even numbers up to 2n.
question a high volume production process produces on average 3.4 defective parts per hour and the number of defects
If you were to accept the null hypothesis, even though the null hypothesis was false, what type of error would you have commited?
The IRS claims that the mean wait time for callers during tax season is at most 7 minutes. A random sample of 11 callers has a mean wait time of 8.7 minutes and a standard deviation of 2.7 minutes. Is there enough evidence to reject the claim at a..
Commute times: three random samples of time in minutes that commuters are stuck in traffic are shown. At anova =0.05, is there a difference in the mean times among the three cities?
there are 300 homes in winetree subdivision. the subdivision committee decided to paint a third of the houses magenta
The lifetime of a super tough AAA battery is normally distributed wit mean of 28.5 hours and standard deviation of 5.3 hours. For a battery selected at random
Assuming the sample size of 40 can be considered as large, compute the confidence interval for a confidence level of 90%.
given are five observations collected in a regression study on two variables.x12691320y1718926231. what percentage of
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