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1.For a sample size of 100 determine the crtitical value for a two-tail hypothesis test at a 5% level of significance when the population standard deviation is unknown. 2.The SAT scores have an average of 1200 with a standard deviation of 60. A sample of 36 scores is selected. What is the probability that the sample mean will be between 1190 and 1210? Round your answer to three decimal places. 3.The sales of a grocery store had an average of $8,000 per day. The store introduced several advertising campaigns in order to increase sales. To determine whether or not the advertising campaigns have been effective in increasing sales, a sample of 64 days of sales was selected. It was found that the average was $8,225 per day. From past information, it is known that the standard deviation of the population is $1,200. The value of the test statistic is 1.5. The p-value associated with this test statistic is 4.The sales of a grocery store had an average of $8,000 per day. The store introduced several advertising campaigns in order to increase sales. To determine whether or not the advertising campaigns have been effective in increasing sales, a sample of 64 days of sales was selected. It was found that the average was $8,150 per day. From past information, it is known that the standard deviation of the population is $1,200. The value of the test statistic is 5.Using the Excel function (t.inv) determine the t value for a 95% confidence interval estimation for a sample size of 50. Round your answer to three decimal places. 6.Playbill Magazine reported that the mean annual household income of its readers is $119,155. Assume this estimate of the mean is based on a sample of 80 households, and based on past studies, the population standard deviation is known to be $30,000. What is the margin of error at a 95% level of confidence? Round your answer to two decimal places. 7. The SAT scores have an average of 1200 with a standard deviation of 60. A sample of 36 scores is selected. What is the probability that the sample mean will be larger than 1220? Round your answer to three decimal places.
What is the difference between common cause variation and special cause variation?
There were 23 people at my last Arachnophobics (fear of spiders) Anonymous' Halloween party. As a gag fake spiders were put into the gift boxes to be handed out when people came in.
Construct a probability for the number of students in the sample who watch soap operas.
Election-day polls are taken from voting precincts selected because they are believed to be representative of all voters.
In Colorado Springs the newspaper runs mug shots of wanted criminals. The 17% of those published are arrested through information provided to the police. If 200 are published, find the probability that less than 30 are arrested.
Is the GPA of this year's students significantly different from the long-run average? At what alpha level would it be significant?
To find a better model, use a transformation on length. One possibility is to use the square. Fit a least squares line using transformed length to predict weight. Write down the equation of the line (model).
What percentage of workers spend more than 100 hours on the internet?A person is classified as a heavy user if he or she is in the upper 20% of usage. how many hours did a worker have to be logged on to the internet to be considered a heavy user?
What is the level of measurement for these items related to the newspaper business?
The number of arrivals per minute at a bank located in the central business district of a large city was recorded over a period of 200 minutes, with the following results:
Suppose that $126,000 is to be allocated for advertising, research, and investment in the ratio 10:4:2. How much money will be allocated for each?
How many women must be randomly selected to estimate the mean weight of women in one age group. We want 90% confidence that the sample mean is within 3.7 lb of the population mean.
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