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in an irs study, it takes a mean of 330 minutes for taxpayers to prepare, copy, and electtronically file a 1040 tax form. this distribution of times follows normal distribution and standard deviation is 80 minutes. a consumer watchdog agency selects a random sample of 40 taxpayers. What is the standard error of the mean? What is the likehood the sample mean is greater than 320 minutes?
If the null hypothesis is rejected, can you state that the mean score of those with a rural background is different from the score of those with a large-city background?
What are the advantages and disadvantages of each? Explain how the empirical rule help explain the ways in which the values in a set of numerical data cluster and distribute?
Assume the wages are normally distributed with a standard deviation of $0.45. If a worker at this car wash is selected at random, what is the probability that the worker earns more than $6.75?
Categorize the following as the example of nominal, ordinal, interval, or ratio level of measurement, and define why it represents this level: marital status of company's employees.
Show the sampling distribution of p if a random sample of 150 insured individuals is used to estimate the proportion having received at least one ticket.
On a test with a population mean of 75 and standard deviation equal to 16, if the scores are normally distributed, what percentage of scores fall below a score of 83.8?
Is there evidence that population mean amount is different form 8.17 ounces? (Use a 0.05 level of significance.) with sample standard deviation of 0.051 ounce.
Find out the regression equation Determine the value of Rsquare? Comment on value.
A researcher used stepwise regression to create regression models to predict Birth Rate (births per 1,000) using five predictors: Life Exp (life expectancy in years).
Robinson & Associates performs employment screening for large companies in southern California. It usually follows two-step process. First potential applicants are given a test that covers basic knowledge and intelligence. If applicants score b..
Let us suppose you have taken 100 samples of size 49 each from normally distributed population. Compute standard deviation of sample means if population's variance is 16. Area to left of ‘z' is 0.9976.
Explain the value of test statistic using t distribution for the given value. Illustrate value of the t test statistic if you are testing a hypothesis.
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