Question

A national survey reports that the average number of screens (TVs, computers, tablets, and smartphones) in a single-family household 11.8, with a standard deviation of 4.13. You believe that average may be different in Hartsville. You collect a sample of 35 households in Hartsville, and find that the average number of screens is 12.01.

Follow the outline to test the hypothesis at a significance level of ?=0.05:

?0:?=11.8??:?≠11.8

Identify the critical z-score for a significance level of ?=0.05

Select your answer from one of the following options.

• a.

  ??=2.33

• b.

  ??=−1.64

• c.

  ??=±2.33

• d.

  ??=1.64

• e.

  ??=±1.96

  Which of the graphs below best represents the rejection region?

  Select your answer from one of the following options.
  • A.

    Graph A

  • B.

    Graph B

  • C.

    Graph C

  Calculate the standardized test statistic ?=?⎯⎯⎯−??/?√

  Round your answer to 2 decimal places.

  Using the standardized test statistic and the critical z-score, draw a conclusion and interpret your result.

  Select your answer from one of the following options.
  • a.

    Reject the null hypothesis There is not enough evidence to conclude that the average number of screens per household in Hartsville is different from the national average.

  • b.

    Reject the null hypothesis There is enough evidence to conclude that the average number of screens per household in Hartsville is different from the national average.

  • c.

    Fail to reject the null hypothesis. There is not enough evidence to conclude that the average number of screens per household in Hartsville is different from the national average.

  • d.

    Fail to reject the null hypothesis. There is enough evidence to conclude that the average number of screens per household in Hartsville is different from the national average.

Answer 1

please like ??