25 A researcher is interested in looking at the effect of a

25. A researcher is interested in looking at the effect of a medicine (denoted by Y) on blood pressure (denoted by X). In this example:

a. X is the independent variable

b. X is the dependent variable

c. Both X and Y are dependent variables

d. Both X and Y are independent variables

e. None of the above

26. Indicate whether the following statement expresses a positive or a negative relationship between sodium intake and probability of high blood pressure: \"When the amount of sodium intake decreases the probability of high blood pressure also decreases.\"

a. Positive relationship

b. Negative relationship

27. The main purpose of conducting a test of hypothesis is to:

a. Make a decision about value of a population parameter based on sample data

b. Make a decision about value of a sample statistic based on population data

c. Bothaandb

d. None of the above

28. The normal distribution

a. is symmetrical

b. is positively skewed

c. is negatively skewed

d. can be any of the above depending on data

e. none of the above

29. Type I error is:

a. the probability of not rejecting H 0 when H 0 is true

b. the probability of not rejecting H 0 when H 0 is false

c. the probability of rejecting H 0 when H 0 is true

d. the probability of rejecting H 0 when H 0 is false

e. the same thing as power

Solution

As multiple questions are posted, first 4 will be answered.

24. e. None of the Above

As Correlation coefficient lies between -1 and 1, and we need actual data to estimate it.

25. b. X is the dependent variable

As effect of Y on X is observed.

26. a. Positive relationship

As both variables are moving in same direction

27. a. Make a decision about value of a population parameter based on sample data

As we have sample data, we infer conclusions about the population