# True or False Statements for the Midterm Flashcards

1
Q

The population mean parameter is a constant, unknown in practice in general.

A

True

2
Q

The variance of a sample made of constant quantities (e.g., n = 3 and x1 = x2 = x3 = 10) is zero.

A

True

3
Q

The expected value of the sum of two random variables is always equal to the sum of the population means of the two random variables.

A

True

4
Q

In the general case, the population variance of the sum of two random variables is equal to the sum of the population variances of the two random variables plus an extra term.

A

True

5
Q

The expected value of the mean of an i.i.d. random sample is always equal to the population mean.

A

True

6
Q
A

False

7
Q
A

False

8
Q
A

True

9
Q

The median may exist for a sample of qualitative data.

A

True

10
Q
A

False

11
Q
A

False

12
Q
A

True

13
Q
A

True

14
Q

The expected value of the sum of two random variables is always equal to the sum of the population means of the two random variables.

A

True

15
Q

In the general case, the population variance of the sum of two random variables is equal to the sum of the population variances of the two random variables plus an extra term.

A

True

16
Q

The population mean of a normal distribution is also its population median and population mode.

A

True

17
Q

The median always exists for a sample of qualitative data.

A

False

18
Q

The expected value of a constant is the constant itself.

A

True

19
Q

The expected value of the sum of two random variables is always equal to the sum of the population means of the two random variables.

A

True

20
Q

The population variance of a constant is equal to the constant.

A

False

21
Q

The population mean of a normal distribution is also its population median and population mode.

A

True

22
Q
A

True

23
Q
A

True

24
Q
A

True

25
Q

The sample mean is random because its value changes from random sample to random sample.

A

True

26
Q

The variance of a random sample made of negative numbers is zero or positive.

A

True

27
Q
A

True

28
Q
A

True

29
Q
A

False

30
Q
A

False

31
Q

The median statistic never exists for a sample of qualitative data.

A

False

32
Q
A

False

33
Q
A

True

34
Q
A

True

35
Q

The median statistic exists sometimes but not always for qualitative sample data.

A

True

36
Q
A

False

37
Q
A

False

38
Q
A

True