A veterinarian wants to know if pit bulls or golden retrievers have a higher incidence of...

A veterinarian wants to know if pit bulls or golden retrievers have a higher incidence of tooth decay at the age of three. The vet surveys 120 three-year-old pit bulls and finds 30 of them have tooth decay. The vet then surveys 160 three-year-old golden retrievers and finds 32 of them have tooth decay. Number the population of pit bulls and golden retrievers by 1 and 2, respectively. Calculate a 90% confidence interval for the difference in the population proportion of pit bulls and golden retrievers that have tooth decay. Which of the following is correct?

[–0.0492, 0.1492]
[–0.0332, 0.1332]
[0.0428, 0.0572]
[0.0199. 0.0801]

Expert Solution

We have given,

x1=30
n1=120

x2=32
n2=160

Level of significance =   0.1
Z critical value (by using Z table)=1.645
Estimate for sample proportion 1=

Estimate for sample proportion 2 =

Confidence interval formula is

=(-0.0332,0.1332)



Lower limit for confidence interval=-0.0332

Upper limit for confidence interval is=0.1332

orchestra answered 2 years ago

Jessica wants to know if gender and/or college major have a significant effect on a person's...

Jessica wants to know if gender and/or college major have a significant effect on a person's social aptitude. To that end, she designs a social aptitude task and administers it to a group of psychology majors who are female, another group of psychology majors that are male, a group of biology that are female and another group of biology majors that are male. The data follows, what can Jessica conclude? psychology majors-female 8,6,7,9 psychology majors-male 5,7,8,6 biology majors- female 7,4,8,9...

A producer of steel cables wants to know whether the steel cables it produces have an...

A producer of steel cables wants to know whether the steel cables it produces have an average breaking strength of 5000 pounds. An average breaking strength of less than 5000 pounds would not be adequate, and to produce steel cables with an average breaking strength in excess of 5000 pounds would unnecessarily increase production costs. the producer collects a random sample of steel cable pieces. the breaking strength for each of these cable pieces is recorded in the file p09_03.xlsx...

Carolina wants to know how much she will have available to spend on her trip to...

Carolina wants to know how much she will have available to spend on her trip to Belize in three years if she deposits $3,000 today at a compound interest rate of 9%. To answer her question, she should refer to which compound interest table? A. Present Value of $1 B. Future Value of $1 C. Future Value of an Annuity of $1 D. Present Value of an Annuity of $1

Luis wants to know how much he will have available to spend on his trip to...

Luis wants to know how much he will have available to spend on his trip to Belize in three years if he deposits $2,700 today at an interest rate of 5%

8. A business wants to know whether two versions of an email offer have the same...

8. A business wants to know whether two versions of an email offer have the same click-through proportion. It sent a random sample of customers an email. It randomly decided which of the two offers went in each email. In the end, it had the following data. 505 out of the 1218 customers that received the first email, clicked on the offer. 468 out of the 1221 customers that received the second email, clicked on the offer. (a) What is...

Ravi wants to know what impact switching to a commission versus a salary system will have...

Ravi wants to know what impact switching to a commission versus a salary system will have on his sales employees’ effectiveness. He selects two of the seven sales regions he is responsible for and changes their pay from salary only to commission only (IV). He compares monthly sales data (DV) for six months prior and six months after this change for the new commission-only regions, and also compares these numbers to the other five salary-only regions. What form of study...

Diana Lee, a supervisor in a manufacturing company, wants to know which employees have increased their...

Diana Lee, a supervisor in a manufacturing company, wants to know which employees have increased their production this year over last year so that she can issue them certificates of commendation and bonuses. Design a flowchart or pseudocode for the following: a. A program that continuously accepts each worker’s first and last names, this year’s number of units produced, and last year’s number of units produced. Display each employee’s data with a message indicating whether the employee’s production has increased...

2. A researcher for Netflix wants to know if people have different preferences for two shows:...

2. A researcher for Netflix wants to know if people have different preferences for two shows: Friends and The Office. The researcher recruits 7 people. Each person watches five minutes of Friends and rates the show on a scale of 0-10, where 0 means they hate it and 10 means they love it. Then each person watches five minutes of The Office rates the show on a scale of 0-10. Assume that you are working at the .05 level of significance. The researcher obtains...

The city police chief wants to know the perceptions African-Americans have of the police force in...

The city police chief wants to know the perceptions African-Americans have of the police force in his city. In comparison to white perception in the community, this information will tell the police chief if he has a community relations problem with the African American community that needs to be addressed. A survey reveals the following information. What would you tell the police chief given these results: Opinion African-American White Feel the police do a good job 74 223 Do not...

A health insurance company wants to know the percentage of its policyholders, who have tried alternative...

A health insurance company wants to know the percentage of its policyholders, who have tried alternative (e.g. herbal) treatments. A random sample of 25 of the company’s policyholders were asked whether or not (Yes or No) they have ever tried such treatment. Below are their responses: Yes Yes No Yes Yes Yes Yes No Yes Yes Yes No No No No No No Yes No No Yes Yes No Yes No a. What is the point estimate of the corresponding...

Question