# Math homework help

## cost for victims

“A study was conducted to estimate hospital costs for accident victims who wore seat belts. Twenty randomly selected cases have a distribution that appears to be bell-shaped with a mean of $9004 and a standard deviation of $5629

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## Task 1 Normal Distribution

Task 1—Normal Distribution

Scores on a statewide standardized test are normally distributed with a mean of 12.89 and a standard deviation of 1.95. Certificates are given to students whose scores are in the top 2% of those who took the test. This means that they scored better than 98% of the other test takers.

## MAT 160 – Hypothesis Testing Homework

MAT 160 – Hypothesis Testing Homework

Name _______________________

1.) Employees in an accounting firm claim that the mean salary of the firm’s accountants is less than that of its competitor’s which is $45,000. (Assume that the standard deviation of the firm’s accountants is known to be $5,200.) A random sample of 30 of the firm’s accountants has a mean salary of $43,500. Test the employees claim at the .01 level of significance.

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