Answered: The average number of miles a person…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Daily Driving The average number of miles a person drives per day is 24. A researcher wishes to see if people over age 60drive less than 24miles per day. She selects a random sample of 32 drivers over the age of 60 and finds that the mean number of miles driven is 23.4. The population standard deviation is 3.7 miles. At =α0.10, is there sufficient evidence that those drivers over 60 years old drive less than 24 miles per day on average? Assume that the variable is normally distributed. Use the critical value method with tables.

State the hypotheses and identify the claim with the correct hypothesis.

:H0=μ ▼claim/ not claim?

:H1>μ145 ▼claim/ not claim?

This hypotheses test is a ▼one-tailed test/two tail?

Part 2 of 5

Find the critical value(s). Round the answer to two decimal places. If there is more than one critical value, separate them with commas.

Critical value(s):

Part 3 of 5

Compute the test value. Always round z score values to two decimal places

Part 4 of 5

Make the decision.

▼reject/Do not reject the null hypothesis.

Part 5 of 5

Summarize the results.

There ▼(Choose one) enough evidence to support the claim that the mean number of Facebook friends is greater than 145.

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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