3. When the population standard deviation is knownand the sample size is greater

Question

3.   When the population standard deviation is knownand the sample size is greater than 30, what table value should beused in computing a confidence interval for a mean?

a.         z

b.         t

c.        Chi-square

d.         None of theabove

6. For each of the following claims mention whatkind of test should be used (one-tail, two-tail) and set up thenull and alternate hypothesis.

b) The 87Cents Store claims that their daily profit is at most$1000.

9.   A set of data contains information aboutcontribution amount based on the number of years (X). Analysis on the set finds that the regression equation is Y=443.18– 50.44X. What can be said of the correspondencebetween number of years and contribution? What is the likelycontribution for 4 years? What does the slope tell you aboutcontribution relative to number of years?

Explanation / Answer

3. a 6b. one-tail H0: = 1000 HA: < 1000 9. We can't tell anything about the correlation just from theregression equation. 443.18-50.44*4 = 241.42 Each additional year is associated with a decrease of 50.44 incontribution amount.

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