1..The mean GPA of all

4000

students at a college is

2.55.

A sample of

100

GPAs from this school has a mean of

2.81.

Which number is

and which is

x?

A.

The statistic is

x=2.55,

and the parameter is

=2.81.

B.

The population mean is

x=2.55,

and the sample mean is

=2.81.

C.

The statistic is

=2.55,

and the parameter is

x=2.81.

D.

The population mean is

=2.55,

and the sample mean is

x=2.81.

2..Question content area top

Part 1

The correlation between house price (in dollars) and area of the house (in square feet) for some houses is 0.91. If you found the correlation between house price in thousands of dollars and area in square feet for the same houses, what would the correlation be?

Question content area bottom

Part 1

Choose the correct answer below.

A.

The new correlation would be 0.00091. Multiplying the values of one variable by 1000 would decrease the correlation by a factor of 1000.

B.

The new correlation would be 0.455. Multiplying the values of one variable by 1000 would decrease the correlation by a factor of 2.

C.

The new correlation would be 0.91. Changing units or multiplying the numbers for a variable by a positive constant does not change the correlation.

D.

The new correlation would be 910. Multiplying the values of one variable by 1000 would increase the correlation by a factor of 1000.

3..The distribution of grade point averages (GPAs) for medical school applicants of a certain year were approximately Normal, with a mean of

3.47

and a standard deviation of

0.32.

Suppose a medical school will only consider candidates with GPAs in the top

12%

of the applicant pool. An applicant has a GPA of

3.73.

Does this GPA fall in the top

12%

of the applicant pool?

A.

Yes.

The cutoff for the top

12%

is a GPA of

enter your response here.

B.

No.

The cutoff for the top

12%

is a GPA of

enter your response here.

4..A multiple-choice test has

four

possible answers, only

one

of which

is

correct, for each question.

a. What is the probability of guessing correctly on one question?

b. What is the probability of guessing incorrectly on one question?

this needs to be solve a. The probability of guessing correctly on one question is

enter your response here.

(Type an integer or a simplified fraction.)Part 2b. The probability of guessing incorrectly on one question is

enter your response here.

(Type an integer or a simplified fraction.)