  (Solution) 11 Change The Sample Size. Suppose That The Sample Mean Is 50 And The Standard Deviation Is Assumed To Be 5. Make A Diagram Similar To Figure 6.7... | Snapessays.com

(Solution) 11 Change the sample size. Suppose that the sample mean is 50 and the standard deviation is assumed to be 5. Make a diagram similar to Figure 6.7...

Can you please help me with these questions?6.11 Change the sample size.

Suppose that the sample mean

is 50 and the standard deviation is assumed to be 5. Make a diagram

similar to Figure 6.7 (page 343) that illustrates the effect

of sample size on the width of a 95% interval. Use the following

sample sizes: 10, 20, 40, and 100. Summarize what the diagram

shows.

6.60 Hypotheses.

In each of the following situations, a significance

test for a population mean

?

is called for. State the null

hypothesis

H

and the alternative hypothesis

H

a

in each case.

(a) A university gives credit in French language courses to students

who pass a placement test. The language department wants

to know if students who get credit in this way differ in their understanding

of spoken French from students who actually take

the French courses. Experience has shown that the mean score

of students in the courses on a standard listening test is 26. The

language department gives the same listening test to a sample

of 35 students who passed the credit examination to see if their

performance is different.

(b) Experiments on learning in animals sometimes measure how

long it takes a mouse to find its way through a maze. The mean

time is 22 seconds for one particular maze. A researcher thinks

that a loud noise will cause the mice to complete the maze faster.

She measures how long each of 12 mice takes with a noise as

stimulus.

(c) The examinations in a large accounting class are scaled after

grading so that the mean score is 75. A self-confident teaching

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