Question: Testing math skills: In order to test the effectiveness of a program to improve mathematical skills, a simple random sample of 45 fifth- graders was

Testing math skills: In order to test the effectiveness of a program to improve mathematical skills, a simple random sample of 45 fifth- graders was chosen to participate in the program. The students were given an exam at the beginning of the program and again at the end. The sample mean increase in the exam score was 12.2 points, with a sample standard deviation of 4.7 points.
a. Construct a 99% confidence interval for the mean increase in score.
b. The developers of the program claim that the program will produce a mean increase of more than 15 points. Does the confidence interval contradict this claim? Explain.

Step by Step Solution

★★★★★

3.18 Rating (192 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

A 10 3 14 1 B Yes because ... 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

Document Format (1 attachment)

570-M-S-D-D (566).docx

120 KBs Word File

Students Have Also Explored These Related Statistics Questions!

In order to test the precision of a new type of blood sugar monitor for diabetic patients, 20 randomly selected monitors of this type were used. A blood sample with 120 mg/dL was tested in each of...

In order to test the relative effectiveness of four different fertilizer mixtures on an orange crop, a Florida farmer applies the fertilizer and measures the yield per unit area when it harvests. The...

In order to test the wear on four hyperalloys, a test piece of each alloy was extracted from each of the three positions of a test machine. The reduction of weight in milligrams due to wear was...

Government governance is the system of management and operations that the firm utilizes to maximize the interest of all stakeholders. Composition of the board of directors is one important factor for...

Testing math skills: In order to test the effectiveness of a program to improve mathematical skills, a simple random sample of 45 fifth graders was chosen to participate in the program. The students...

Identify the process evaluation article that you chose and explain why you selected this example. Describe the purpose of the evaluation, the informants, the questions asked, and the results of the...

5, Putting Together an Evaluation Matrix An evaluation plan is a written document that describes the cWill/mat\Questions to ask yourself when putting together an evaluation matrix: Evaluation...

Describing Data Once we have collected data from surveys or experiments, we need to summarize and present the data in a way that will be meaningful to the reader. We will begin with graphical...

Summarize the attached document of the WDR 2018 OVERVIEW Learning to realize education's promise Learning to realize education's promise Assess learning Act on evidence Align actors to make it a...

yt1). A signal x(n) is applied to a system with unit pulse response hn) whose nonzero values are given in the table below. The output signal of the system is ytn). Find -1 2 h(n) 3.

Steel Corp. purchases equipment and places it in service for a total cost of $85,500. The equipment will have a useful life of 20,000 hours and have a salvage value of $3,500. In year 2 the equipment...

26. LO.6 At the time of Emiles death, he was a joint tenant with Colette in a parcel of real estate. With regard to the inclusion in Emiles gross estate under 2040, comment on the following...

Outline the two purposes to be achieved in accounting for inventory. Explain the relationship between these purposes. Explain which of the two purposes to be achieved in accounting for inventory is...

Over the years, African-American actors in major cinema releases have been more likely than white actors to have major roles in comedies. The table shows the percent of all roles by type of picture....

Most golfers are probably happy to play 18 holes of golf whenever they get a chance to play. Ben Winter, a club professional, played 306 holes in 1 day at a charity golf marathon in Stevens,...

The U.S. census found that babies enter the world during the various months in the proportions that follow. A random sample selected from the birth records for a large metropolitan area resulted in...

Jennifer's manager Dr. Jonathan Steinberg wonders whether Healthy Life members needed more chiropractic help in 2020 than in 2019, on average. Jennifer selected a random sample of those who were...

Naomi receives a report of smishing. What type of attack should she be looking for? Group of answer choices A . Compressed files in phishing B . Text message based phishing C . Voicemail - based...

Consider the following table, which gives a security analyst's expected return on two stocks for two particular market returns: Market Return Aggressive Stock Defensive Stock 8% 2.5% 4.3% 20 27 14 a....