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Editors of the business report in given Exercise are willing to accept a margin of error of 4% but want 99% confidence. How many randomly selected employers will they need to contact?
Exercise :Hiring. In preparing a report on the economy, we need to estimate the percentage of businesses that plan to hire additional employees in the next 60 days.
a) How many randomly selected employers must we contact in order to create an estimate in which we are 98% confident with a margin of error of 5%?
b) Suppose we want to reduce the margin of error to 3%. What sample size will suffice?
c) Why might it not be worth the effort to try to get an interval with a margin of error of only 1%?
By indicating the lower and upper confidence limits for each mean, a graph can convey at a glance the reliability that goes with each point. Calculate a 95 percent confidence interval for each mean.
tompkins associates reports that the mean clear height for a class a warehouse in the united states is 22 feet. suppose
What might lead minority students to take more or fewer high school math courses? Would these same factors influence success in college?
Students will meet the required "oral" component of the presentation by posting a PowerPoint presentation including the following criteria:
Are there any (finite) values for which the area above that value is the same for all t-distributions? If so, specify the value(s) and the area(s). If not, explain why not.
Suppose you always reject the null hypothesis, regardless of any sample evidence.
Suppose a random sample of 600 credit card users is taken. What is the probability that more than 150 credit card users are very close to the total limit on their card(s)?
suppose a pitcher throws a fastball 80 of the time and a curveball 20 of the time. when its a fastball a home run is
Apopulation consists of individuals whose weights are uniformly distributed between 100 and 175 pounds. What is the probability level for this distribution?
If the P-value of a hypothesis test comparing two means was 0.25, what can you conclude? (Select all that apply):
In a study relating the amounts of time required for room service delivery at a newly openedRadissonHotel, 20 deliveries had a mean time of 24.2 min and a standard deviation of 8.7 min. The sample data appears to have a bell-shaped distribution. F..
A person purchased a slot machine and tested it by playing it 1,245 times. There are 10 different categories of outcomes, including no win, win jackpot, win with three balls, and so on.
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