MAT 120 Unit 3 Review Sect 602

When 410 junior college students were surveyed, 105 said that they have previously owned a motorcycle. Find a point estimate for p, the population proportion of students who have previously owned a motorcycle.

• 0.344

• 0.256

• 0.204

• 0.744

Tags

CCSS.HSS.IC.B.4

Determine the critical value Z_{α/2} that corresponds to the given level of confidence. 92%

• 1.45

• 1.75

• 0.82

• 1.41

Tags

CCSS.HSS.ID.A.4

A pollster wishes to estimate the number of left-handed scientists. What size sample should be obtained in order to be 90% confident that the sample proportion will not differ from the true proportion by more than 4%? A previous study indicates that the proportion of left-handed scientists is 11%.

• A) 187

• B) 9

• C) 101

• D) 166

Tags

CCSS.HSS.IC.B.4

If no estimate of p exists when determining the sample size, we can use 0.5 in the formula to get a value for n.

• True

• False

Tags

CCSS.HSS.IC.B.4

A researcher at a major clinic wishes to estimate the proportion of the adult population of the United States that has sleep deprivation. What size sample should be obtained in order to be 90% confident that the sample proportion will not differ from the true proportion by more than 5%?

• 271

• 542

• 164

• 9

Tags

CCSS.HSS.IC.B.4

Determine the point estimate of the population mean and margin of error for the confidence interval with lower bound 3 and upper bound 27.

• x̄ = 3, E = 24

• x̄ = 27, E = 12

• x̄ = 15, E = 12

• x̄ = 15, E = 24

Tags

CCSS.HSS.IC.B.4

Find the t-value such that the area in the right tail is 0.05 with 34 degrees of freedom.

• -1.691

• 1.694

• 1.691

• 2.728

Tags

CCSS.HSS.ID.A.4

The principal at Riverside High School would like to estimate the mean length of time each day that it takes all the buses to arrive and unload the students. How large a sample is needed if the principal would like to assert with 90% confidence that the sample mean is off by, at most, 7 minutes. Assume that s = 14 minutes based on previous studies.

• A) 10

• B) 12

• C) 13

• D) 7

Tags

CCSS.HSS.IC.B.4

In a random sample of 60 dog owners enrolled in obedience training, it was determined that the mean amount of money spent per owner was 12, construct and interpret a 95% confidence interval for the mean amount spent per owner for an obedience class.

• a) T-Stats;

  b) Lower bound: $106.23, Upper bound: $112.43;

  c) We are 95% confident that the true mean amount spent per owner for an obedience class is between $106.23 and $112.43.

• a) Proportion Stats;

  b) Lower bound: $106.23, Upper bound: $112.43;

  c) We are 95% confident that the true mean amount spent per owner for an obedience class is between $106.23 and $112.43.

• a) T-Stats;

  b) Lower bound: $100.00, Upper bound: $120.00;

  c) We are 95% confident that the true mean amount spent per owner for an obedience class is between $100.00 and $120.00.

• a) Proportion Stats;

  b) Lower bound: $100.00, Upper bound: $120.00;

  c) We are 95% confident that the true mean amount spent per owner for an obedience class is between $100.00 and $120.00.

Tags

CCSS.HSS.IC.B.4

A survey of 1010 college seniors working towards an undergraduate degree was conducted. Each student was asked, "Are you planning or not planning to pursue a graduate degree?" Of the 1010 surveyed, 658 stated that they were planning to pursue a graduate degree. What is the 98% confidence interval for the proportion of college seniors who are planning to pursue a graduate degree?

• a) proportion stats

  b) 0.617 to 0.686

  c) We are 98% confident that the proportion of college seniors who are planning to pursue a graduate degree are between 0.617 and 0.686

• a) proportion stats

  b) 0.625 to 0.695

  c) We are 98% confident that the proportion of college seniors who are planning to pursue a graduate degree are between 0.625 and 0.695

• a) t-stats

  b)0.635 to 0.685

  c) We are 98% confident that the proportion of college seniors who are planning to pursue a graduate degree are between 0.635 and 0.685

• a) t-stats

  b) 0.645 to 0.675

  c) We are 98% confident that the proportion of college seniors who are planning to pursue a graduate degree are between 0.645 and 0.675

Tags

CCSS.HSS.IC.B.4