Question: The researchers now plan to construct a 99% confidence interval for the test scores described in Exercise 11. a. What is the critical value z2

The researchers now plan to construct a 99% confidence interval for the test scores described in Exercise 11.

a. What is the critical value zα∕2 for this confidence interval?

b. Find the margin of error for this confidence interval.

c. Let m represent the margin of error for this confidence interval. For what percentage of all samples will the confidence interval x̄ ± m cover the true population mean?

Exercise 11

To determine how well a new method of teaching vocabulary is working in a certain elementary school, education researchers plan to give a vocabulary test to a sample of 100 sixth graders. It is known that scores on this test have a standard deviation of 8.

Step by Step Solution

★★★★★

3.47 Rating (150 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

Solution for Confidence Interval on Test Scores a Critical Value z2 For a 99 confidence interval the ... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Students Have Also Explored These Related Elementary Statistics Questions!

CANMNMM January of this year. (a) Each item will be held in a record. Describe all the data structures that must refer to these records to implement the required functionality. Describe all the...

The Tastee Bakery Company supplies a bakery product to many supermarkets in a metropolitan area. The company wishes to study the effect of the height of the shelf display employed by the supermarkets...

1. The state education commission wants to estimate the fraction of tenth grade students that have reading skills at or below the eighth grade level. In an earlier study, the population proportion...

Need help with this assignment if someone could do that for me! The Charts are the Z score table and T-score table as well! USE ONLY THE ZSCORES AND TSCORES FROM THE CHARTS (not your calculator) when...

Need help with this assignment if someone could help me that would be very much appreciated! USE ONLY THE ZSCORES AND TSCORES FROM THE CHARTS (not your calculator) when showing your work!! Be sure to...

al Exam e T L L This test: 150 point(s) possible This question: 8 point(s) possible & EIL LR According to a certain government agency for a large country, the proportion of fatal traffic accidents in...

For the question 11 I need answer for test statistics, the critical value and and part d. E Homework: Ch 11 HW Question 11, 11.3.7 HW Score: 47.51%, 29.93 of 63 points Save Part 4 of 8 Points: 4.8 of...

7.1 8.) Find the critical value z/2 that corresponds to the confidence level 84%. z/2 =_____ 12.) A clinical trial tests a method designed to increase the probability of conceiving a girl. In the...

BBUNDERSTAT12 9.4.001. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Use the following linear regression equation to answer the questions. x1 = 1.7 + 3.0x2 - 7.6x3 + 1.6x4 Suppose x3 and x4 were held at...

1. Bode has cumulative earnings of $61,200. His current earnings are $3,366.00. Bode's 2020 OASDI withholding is: $ And his 2020 HI withholding is: $ 2. Dale's current earnings total a gross amount...

A manufacturer of PC monitors is interested in the effects that the type of glass and the type of phosphor used in the manufacturing process have on the brightness of the monitors. The director of...

Marc has purchased a new car for RM 1 5 , 0 0 0 . He paid RM 2 , 5 0 0 as down payment and he paid the balance by a loan from his hometown bank. The loan is to be paid on a quarterly basis for two...

ThermoTech seeks your assistance in developing cash and other budget information for September, October, and November. On August 30, the company had cash of $6,500, accounts receivable of $437,000,...

To the left of z = 1.31 Find the area under the standard normal distribution curve.

To the left of z = 2.11 Find the area under the standard normal distribution curve.

To the right of z = 1.92 Find the area under the standard normal distribution curve.

As cash manager for an oil company, you are responsible for the firms cash management activities. One of these activities is the management of the firms retail cash collection system. Your firm...

QUESTION 1 Ayuba Medie Lid, a South Afficin mins media and artertairmert compery is having a bed year in 2 0 0 4 , as the compary hes incurred a R 4 , 0 tillon reet lows. The loss has pushed mast of...

Answer Part C 2 for the Journal Entry Prepare journal entries to record transactions a through h . a . Raw materials purchased on credit, $ 9 8 , 0 0 0 . b . Direct materials used, $ 4 1 , 5 0 0 ....