Please Solve minimal explanation required

2.) Which of the following is a point estimate for the population mean ()?

x/n

xbar

s

3.)

For an alternative hypothesis: > 6,700, where is the rejection region for the hypothesis test located?

In both tailsIn the left or lower tailIn the right or upper tailIn the center

4.)

The average cost of tuition and room and board at a small private liberal arts college is reported to be $8,500 per term, but a financial administrator believes that the average cost is higher. A study conducted using 350 small liberal arts colleges showed that the average cost per term is $8,745. The population standard deviation is $1,200. Let = 0.05. What are the null and alternative hypotheses for this study?

H₀: $9,000; H₁: > $9,000

H₀: $9,000; H₁: < $9,000

H₀: $8,500; H₁: > $8,500

H₀: $8,500; H₁: < $8,500

5.)

A random sample of size 15 is selected from a normal population. The population standard deviation is unknown. Assume the null hypothesis indicates a two-tailed test and the researcher decided to use the 0.10 significance level. For what values oftwill the null hypothesis not be rejected?

To the left of -1.282 or to the right of 1.282

To the left of -1.345 or to the right of 1.345

Between -1.761 and 1.761

To the left of -1.645 or to the right of 1.645

6.)

There are 2,000 eligible voters in a precinct. A total of 500 voters are randomly selected and asked whether they plan to vote for the Democratic incumbent or the Republican challenger. Of the 500 surveyed, 350 said they would vote for the Democratic incumbent. Using the 0.99 confidence coefficient, what are the confidence limits for the proportion that plan to vote for the Democratic incumbent?

0.647 and 0.753

0.612 and 0.712

0.397 and 0.797

0.826 and 0.926

Question 7

A random sample of 42 college graduates revealed that they worked an average of 5.5 years on the job before being promoted. The sample standard deviation was 1.1 years. Using the 0.99 degree of confidence, what is the confidence interval for the population mean?

5.04 and 5.96

5.06 and 5.94

2.67 and 8.33

4.40 and 6.60

8.)

To test the hypothesis that 55% of those families who plan to purchase a vacation residence in Florida want a condominium, the null hypothesis is = 0.55 and the alternate is .55. A random sample of 400 families who planned to buy a vacation residence revealed that 228 families want a condominium. What decision should be made regarding the null hypothesis using the 0.01 level of significance?

Do not reject it.

Reject it.

Cannot accept it or reject it based on the information given.

9.)

The mean annual incomes of certified welders are normally distributed with the mean of $50,000 and a standard deviation of $2,000. The ship building association wishes to find out whether their welders earn more or less than $50,000 annually. The alternate hypothesis is that the mean is not $50,000. If the level of significance is 0.10, what is the critical value?

+1.645

-1.282

1.282

1.645

10.)

A survey of 50 retail stores revealed that the average price of a microwave was $375, with a sample standard deviation of $20. Assuming the population is normally distributed, what is the 95% confidence interval to estimate the true cost of the microwave?

$323.40 to $426.60

$328.40 to $421.60

$350.80 to $395.80

$369.31 to $380.69

11.)

A random sample of 85 supervisors revealed that they worked an average of 6.5 years before being promoted. The population standard deviation was 1.7 years. Using the 0.95 degree of confidence, what is the confidence interval for the population mean?

6.99 and 7.99

4.15 and 7.15

6.14 and 6.86

6.49 and 7.49