Homework 10 questions from 14-week course Homework 10 Questions from 14-week

**Question 1 ****(Mandatory)**** **(0.5 points) In 2015 the Census Bureau reported the poverty rate was 13.5%. A researcher would like to know if that has decreased in the past 4 years. He randomly selects 1100 people living in the U.S. and determines that 119 were living in poverty. Homework 10 Questions from 14-week

Which hypothesis statements are correct for this situation?

Question 1 options:

**Question 2 ****(Mandatory)**** **(0.5 points)

Question 2 options:

According to Food Allergy Research and Education (FARE) 13% of children in the U.S. have food allergies. A pediatrician suspects that this percentage it is higher in her metropolitan area. She randomly selects 250 children from her metropolitan area and discovers that 35 have food allergies. Homework 10 Questions from 14-week

Write the hypothesis statements for this situation below.

H_{o}:

H_{A}:

**Question 3 ****(Mandatory)**** **(2.5 points)

Question 3 options:

A researcher claims that more than 38% of U.S. adults have been a victim of identity theft. In a random sample of 485 U.S. adults 199 of them have been a victim of identity theft. Use a 10% significance level to determine if there is enough evidence to support the researcher’s claim. Homework 10 Questions from 14-week

H_{o}:

H_{A}:

Z-stat =

*Round to 2 decimal places.*

p-value =

*Do not round.*

Decision:

Type either Reject H_{o} or Retain H_{o}

**Question 4 ****(Mandatory)**** **(0.5 points)

Which statement correctly summarizes the outcome of the hypothesis test.

Question 4 options:

The sample data does not suggest that the proportion of U.S. adults that have been a victim of identity theft is significantly greater than 38%. | |

The sample data suggests that the proportion of U.S. adults that have been a victim of identity theft is significantly less than 38%. | |

The sample data suggests that the proportion of U.S. adults that have been a victim of identity theft is approximately 38%. | |

The sample data suggests that the proportion of U.S. adults that have been a victim of identity theft is significantly greater than 38%. |

**Question 5 ****(Mandatory)**** **(0.5 points)

You’re an accounting manager. A year-end audit showed 3% of transactions had errors. You implement new procedures. A random sample of 150 transactions had 4 errors. You want to know if the proportion of incorrect transactions decreased. Homework 10 Questions from 14-week

Which assumption or condition if any does not check out?

Question 5 options:

Randomization assuption | |

Independence assumption | |

They all check out. |

**Question 6 ****(Mandatory)**** **(2.5 points)

Question 6 options:

In a clinical trial, 19 out of 800 patients taking a prescription drug complained of flulike symptoms. Suppose that it is known that 2.9% of patients taking competing drugs complain of flulike symptoms.

Is this sufficient evidence to conclude that less than 2.9% of this drug’s users experience flulike symptoms as a side effect? (Let α=0.05) Homework 10 Questions from 14-week

H_{o}:

H_{A}:

Z-stat =

*Round to 2 decimal places.*

p-value =

Decision:

Type either Reject H_{o} or Retain H_{o}

**Question 7 ****(Mandatory)**** **(0.5 points)

Write a summary statement for the hypothesis test.

Question 7 options:

**Question 8 ****(Mandatory)**** **(0.5 points)

A type I error is always made when:

Question 8 options:

the alternative hypothesis is rejected when it is true | |

the null hypothesis is rejected when it is true | |

the null hypothesis is not rejected when it is false | |

the alternative hypothesis is not rejected when it is false |