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An advertising agency that serves a major radio station wants to estimate the mean amount of time that the station's audience spends listening to the radio daily. From past studies, the standard deviation is estimated as 45 minutes.
a. What sample size is needed if the agency wants to be 90% confident of being correct to within ± 5 minutes?
b. If 99% confidence is desired, what sample size is necessary?
If garage is robbed, determine the probability doors were left open?
A student team examined parked cars in four different suburban shopping malls. One hundred vehicles were examined in each loation.
With a single-sample t ratio, the null hypothesis states that:
Does the overall data support the mayor's claim?
Does this sample indicate a smaller average? Use α = 0.05 and assume a normally distributed population.
Find the probability that in a given year,a) Exactly one major hurricane will strike the U.S. mainland
Describe the error in the conclusion. Given: There is a linear correlation between the number of cigarettes smoked and the pulse rate. As the number of cigarettes increases the pulse rate increases. Conclusion: Cigarettes cause the pulse rate to i..
A group of sheep, infested with tapeworms, are randomly divided into two groups as follows. Each sheep is assigned a number (1 through 20) and then 10 numbers
Suppose that X1,..,Xn form a random sample from the normal distribution with unknown mean M and unknown standard deviation S, and let m and s denote the MLEs of M and S. for the sample size n=17, find a value of k such that P(m > M +ks) = 0.95
The scores of college-bound senior men on the math part of the SAT followed a normal distribution with mean 527 and standard deviation 116.
Determine and interpret a 95% confidence interval for the mean amount of time Americans age 15 or older spend eating and drinking each day.
Play 100 games of scraps and empirically determine an estimate for the probability of winning.
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