Warning: foreach() argument must be of type array|object, bool given in /var/www/html/web/app/themes/studypress-core-theme/template-parts/header/mobile-offcanvas.php on line 20

Judy is interested in the reading level of a medical journal. She records the length of a random sample of100words. The histogram displays the distribution of word length for her sample. Determine if the Normal/Large Sample condition is met in this context.

Short Answer

Expert verified

The condition of normality is met.

Step by step solution

01

Given Information

The graph is as below:

02

Explanation

Observations from graph:

  • The distribution shape is left skewed containing two outliers.
  • Distribution is left skewed. Therefore it can be refer to as normal distribution normally.
  • As sample size is 100>30.
  • Applying Central Limit Theorem, since sample size is larger; so distribution is normally normal.
  • So, we can use condition for tdistribution.

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 Vaia!

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

Prayer in school Refer to Exercise 5.

a. Explain what would happen to the length of the interval if the confidence level were increased to 99%.

b. How would a 95%confidence interval based on double the sample size compare to the original 95%interval?

c. The news article goes on to say: โ€œThe theoretical errors do not take into account

additional errors resulting from the various practical difficulties in taking any survey of public opinion.โ€ List some of the โ€œpractical difficultiesโ€ that may cause errors which are not included in the ยฑ3 percentage point margin of error.

Lying online Many teens have posted profiles on sites such as Facebook. A sample survey asked random samples of teens with online profiles if they included false information in their profiles. Of 170younger teens (ages role="math" localid="1654194610029" 12to14) polled, 117said โ€œYes.โ€ Of 317older teens (ages 15to17) polled, 152said โ€œYes.โ€ A 95%confidence interval for pY-pO=the true difference in the proportions of younger teens and older teens who include false information in their profile is 0.120to 0.297.

a. Interpret the confidence interval.

b. Does the confidence interval give convincing evidence of a difference in the true

proportions of younger and older teens who include false information in their profiles?

Explain your answer.

More income The 2015American Community Survey estimated the median household income for each state. According to ACS, the 90%confidence interval for the 2015

median household income in New Jersey is \(72,222ยฑ\)610.

a. Interpret the confidence interval.

b. Interpret the confidence level.

Itโ€™s critical Find the appropriate critical value for constructing a confidence interval in each of the following settings.

a. Estimating a population proportion p at a 94% confidence level based on an SRS of size 125

b. Estimating a population mean ฮผ at a 99% confidence level based on an SRS of size 58

Reading scores in Atlanta The Trial Urban District Assessment (TUDA) is a

government-sponsored study of student achievement in large urban school districts. TUDA gives a reading test scored from 0to 500. A score of 243is a โ€œbasicโ€ reading level and a score of 281is โ€œproficient.โ€ Scores for a random sample of 1470eighth-graders in Atlanta had a mean of 240with standard deviation of 42.17.

a. Construct and interpret a 99%confidence interval for the mean reading test score of all Atlanta eighth-graders.

b. Based on your interval from part (a), is there convincing evidence that the mean reading test score for all Atlanta eighth-graders is less than the basic level? Explain your answer.

See all solutions

Recommended explanations on Math Textbooks

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.

Sign-up for free