/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Q9 Critical Value Refer to Exercise... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 7: Q9 (page 350)

Critical Value Refer to Exercise 7 鈥淩equirements鈥� and assume that the requirements are satisfied. Find the critical value that would be used for constructing a 95% confidence interval estimate of 渭using the t distribution.

Short Answer

Expert verified

The critical value for computing the 95% confidence interval estimate of the mean voltage level is equal to 2.201.

Step by step solution

01

Given information

Referring to Exercise 7 CQQ, a sample of size (n) equal to 12 smartphone batteries is considered to estimate the mean voltage level. The confidence level is given to be equal to 95%.

02

Value of tα2

The confidence level is given to be equal to 95%. Thus, the level of significance 伪is equal to 0.05.

Now, the level of significance corresponding to the t-value is computed below:

伪2=0.052=0.025

The value of the degrees of freedom is is calculated in the following manner:

df=n-1=12-1=11

Now, the value ofrole="math" localid="1648193070546" t伪2for 11 degrees of freedom and 0.025 significance level is equal to 2.201.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Mean Body Temperature Data Set 3 鈥淏ody Temperatures鈥� in Appendix B includes a sample of 106 body temperatures having a mean of 98.20掳F and a standard deviation of 0.62掳F. Construct a 95% confidence interval estimate of the mean body temperature for the entire population. What does the result suggest about the common belief that 98.6掳F is the mean body temperature?

Finite Population Correction Factor For Formulas 7-2 and 7-3 we assume that the population is infinite or very large and that we are sampling with replacement. When we sample without replacement from a relatively small population with size N, we modify E to include the finite population correction factor shown here, and we can solve for n to obtain the result given here. Use this result to repeat part (b) of Exercise 38, assuming that we limit our population to a county with 2500 women who have completed the time during which they can give birth.

E=z伪2p^q^nN-nN-1

n=Np^q^z伪22p^q^z伪22+N-1E2

In Exercises 9鈥�16, assume that each sample is a simple random sample obtained from a population with a normal distribution.

Highway Speeds Listed below are speeds (mi/h) measured from southbound traffic onI-280 near Cupertino, California (based on data from Sig Alert). This simple random sample was obtained at 3:30 PM on a weekday. Use the sample data to construct a 95% confidence interval estimate of the population standard deviation. Does the confidence interval describe the standard deviation for all times during the week?

62 61 61 57 61 54 59 58 59 69 60 67

Atkins Weight Loss Program In a test of weight loss programs, 40 adults used the Atkins weight loss program. After 12 months, their mean weight loss was found to be 2.1 lb, with a standard deviation of 4.8 lb. Construct a 90% confidence interval estimate of the mean weight loss for all such subjects. Does the Atkins program appear to be effective? Does it appear to be practical?

Constructing and Interpreting Confidence Intervals. In Exercises 13鈥�16, use the given sample data and confidence level. In each case, (a) find the best point estimate of the population proportion p; (b) identify the value of the margin of error E; (c) construct the confidence interval; (d) write a statement that correctly interprets the confidence interval.

Medical Malpractice In a study of 1228 randomly selected medical malpractice lawsuits, it was found that 856 of them were dropped or dismissed (based on data from the Physicians Insurers Association of America). Construct a 95% confidence interval for the proportion of medical malpractice lawsuits that are dropped or dismissed.
See all solutions

Recommended explanations on Math Textbooks

Logic and Functions

Read Explanation

Applied Mathematics

Read Explanation

Mechanics Maths

Read Explanation

Calculus

Read Explanation

Pure Maths

Read Explanation

Probability and Statistics

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.