The correlation coefficient ,r, must have a value between 0 and 1.

Select one:

a. trueb. falsec. not enough information given

Question2

Ifrhas the value of 0.60, then 60% of the variability in y can be explained by the variability in x.

Select one:

a. trueb. falsec. not enough information given

Question3

A high correlation between two variables suggests that a change in the independent variable (x) will cause a change in the dependent variable (y). Select one:

TrueFalse

Question4

The null hypothesis of no correlation between two variables can never be rejected ifris less than zero. Select one:

a. trueb. falsec. not enough information given

Question5

If the slope of the regression line is negative, then the relationship between the independent and dependent variable is called _____________. Select one:

a. directb. abstractc. inversed. platonice. avuncular

Question6

The following constitute a random sample of 14 measurements for the temperature of an indoor pool: 84.2, 88.7, 85.1, 80.5, 83.4, 85.6, 76.2, 80.9, 79.3, 83.0, 83.7, 86.3, 88.3, 84.8 Use the one-sample sign test to determine thep-value for the null hypothesis the population median = 83.0 against the alternative hypothesis the population median is greater than 83.0. Express your answer rounded to 3 places of decimal. Note that you don't have to have a specific value of (alpha)in order to find thep-value.

Answer:

Question7

A sample of 12 patients had their lung capacity measured before and after a certain treatment with the following results:

Patient	1	2	3	4	5	6	7	8	9	10	11	12
Before	750	860	950	830	750	680	720	810	750	680	720	830
After	850	880	930	860	800	740	760	800	800	640	750	800

Use theSign Testto test the hypothesis that the treatment provides an increase in lung capacity. State yourp-value rounded to 3 places of decimal.

Answer:

Question8

The urinary fluoride concentration (PPM) was measured both for a sample of livestock grazing in an area previously exposed to fluoride pollution and for a similar sample grazing on an unpolluted region.

Polluted: 21.3, 18.7, 23.0, 17.1, 16.8, 20.9, 19.7

Unpolluted: 14.2, 18.3, 17.2, 18.4, 20.0

Use theUtest to see if there is evidence at the 5% level of significance to conclude the true average fluoride concentration for livestock grazing on the polluted region is larger than for the unpolluted region. For this question state the appropriatecritical valueofUas a whole number.

Answer:

Question9

Same data as question 8, state the appropriatecalculated valueofU.

Answer:

Question10

For the data below, find theW₁value which you would use if you were going to do aUtest. Don't bother to do the test. Sample 1:7, 12, 20, 21, 9 Sample 2:25, 6, 11, 12, 20, 20