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In a random sample of 26 people, the mean number of books they had read in the past year was 14.93 books and the standard deviation was 16.60 books. Assume the variable is normally distributed and use a t-distribution to construct a 90% confidence interval or the population mean u. What is the margin of error of u?
The confidence interval or the population mean u is ?(_____,_____).
(round the final answer to the nearest hundredth as needed. Round all intermediate values to the nearest thousandth as needed.)
The margin of error of u is ? _____ round to nearest thousandth as needed.
Construct a frequency distribution of the sample mean, and plot a histogram of this distribution. Use the central limit theorem to calculate and identify the sampling distribution of the sample mean.
A researcher is conducting proportionate stratified random sampling with a sample size of 250. Approximately how many people should be sampled from each stratum?
Using a separate 2 by 2 table, compute predictive value positive and predictive value negative for population of 1,000 drug users.
Use empirical Rule to evaluate proportion of costs within 2 standards deviations of mean. Write down these limits.
Average Precipitation For the first 7 months of the year, the average precipitation in Toledo, Ohio, is 19.32 inches. If the average precipitation is normally distributed with a standard deviation of 2.44 inches, find these probabilities.
Under what circumatances do you use a one-sided confidence interval instead of a 2 sided confidence interval?
Assume a population standard deviation of 450-kilowatt hours. Determine the standard error of the mean.
What is the null hypothesis in a chi-squared test of independence? How many 'tails' can a chi-squared test have, one or two? In a regression analysis, what do the residuals from the fitted line add up to?
Suppose that we generate a random sample from a given dis- tribution. If it is desired that the probability that the sample mean will be within 2 standard deviations of the mean of the distribution is at least .99, how large should the sample size..
Suppose that the average annual salary for a worker in the United States is $30,000 and that annual salaries for Americans are normally distributed with a standard deviation equal to $7,000. Determine the following:
What is the probability of selecting a value at random and discovering that it has a value of less than 395 pounds?
In this problem set you will get some practice performing a linear regression analysis. If you use Statdisk or Excel to perform any portion of these analyses, please include the results, label them, and refer to them accordingly in your interpreta..
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