what are the correct answers to this questions. Please help. thank you

1. Question 1

The power of a statistical procedure is the:

The probability that a statistical test will detect a significant difference if one exists

The capacity of the computer to run complex statistical analyses

The probability that that a statistical test will detect a significant difference that does not exist

Degree to which the null hypothesis is false

1. Question 2

Which of the following parametric correlational procedures looks at the extent of a relationship between 2 variables?

Spearman rho

Multiple regression

Kendell tau

Pearson product-moment

1. Question 3

Many decisions need to be made in selecting the appropriate statistical procedure for a study. Which of the following statements about the selection of statistical procedures is true?

A wide variety of possible statistical analyses can be performed on a specified study

The statistician makes all of the decisions about what analysis is appropriate

Specifying the purpose of the study and stating the hypothesis or research questions will narrow the options of statistical procedures considerably

Decision trees are of little assistance to the new researcher in search of the appropriate analysis technique for a specific study

1. Question 4

What level of data is defined as named, labeled or representative of 2 or more exclusive categories?

Nominal

Ordinal

Ratio

Interval

1. Question 5

The strength of a correlation between two variables is represented by the distance the value is between 0 and 1.0 (+ or -). Which of the following correlations is the strongest?

75

-.9

90

50

1. Question 6

In a research article, you find thatris reported to be .48. How would you interpret this finding?

The relationship is strong

The relationship is moderate

The relationship is weak

The relationship is reported incorrectly

1. Question 7

In nursing research, which of the following researcher factors is the most important in relation to the statistical data analysis?

The researcher should not consult a statistician until after the data are collected

The researcher should be able to perform the statistical analysis without assistance from a statistician

The researcher should know all of the statistical formulas needed to analyze the data

The researcher should understand the meaning of the underlying choice and interpretation of statistics

1. Question 8

A Type I error occurs when

The wrong statistical procedures were used

The results indicate a statistically significant difference when in reality, no significant difference exists

The data were not measured at the interval level

The results are not statistically significant.

1. Question 9

The most common purpose for a Pearson correlation is to examine:

Differences between two or more groups

Relationships among groups

Differences between variables

The relationship between 2 variables

1. Question 10

What level of data is defined as named and ranked or as numbers carrying meaning with larger numbers equaling greater amounts of the attribute being measured?

Interval

Ordinal

Nominal

Ratio

1. Question 11

The mean is a basic statistic that forms the base for many more advanced statistical procedures. Which of the following statements about the mean is true?

It is the mathematical average of a set of scores

It represents the most frequently occurring scores in the set of scores

It is unaffected by outlier or extreme score

It is a measure reflecting the way a set of scores is spread out

1. Question 12

Many researchers become excited when they identify statistically significant relationships between variables and may interpret this to mean that the relationship is very important. When the percentage of variance explained is calculated, however, the picture is different. Which of the following statements about percentage of variance is (are) true?

A correlation of .40 would explain 16% of the variance, leaving 84% unexplained

It is calculated by squaring thervalue

All of the above

The obtained value will be lower than therunless the correlation is perfect

1. Question 13

Which of the following is NOT a characteristic of analysis of variance (ANOVA)?

It tests for differences between means

TheF statistic is used to report results

It can only be used with two groups

It often requires post-hoc tests to identify locations of differences.

1. Question 14

A researcher reports that the effect of an intervention did not lead to statistically significant differences between the intervention and the control groups. Changes in scores were, however, in the direction anticipated with the theory. Which of the following study flaws is most likely?

The sample may have been too small

The logic used in designing the study was faulty

The intervention should be abandoned

The study was poorly done

1. Question 15

Which of the following is NOT a descriptive statistic?

Correlation

Frequency of Distribution

Standard Deviation

Mean

1. Question 16

What level of data is defined as named, ranked and equidistant from an absolute zero point?

Interval

Nominal

Ratio

Ordinal

1. Question 17

A variance that occurs when individual scores vary around the group mean is referred to as:

Between group variance

Homogeneous variance

Within group variance

Total group variance

1. Question 18

When looking at an alpha (a) level of significance for determining differences between groupswhich of the following probability (p) levels has the most significant difference?

none of the above ??? maybe the right answer

.04

.01

.001

1. Question 19

According to the theoretical normal curve, what percent of the scores in a data set are within 2 standard deviations (above and below) the mean?

68%

95%

99%

50%

1. Question 20

Which of the following statements about the use of descriptive statistics is true?

They are used in every research study, qualitative as well as quantitative

All of the above

They are used to address objectives of some studies

They are used to identify patterns in data

1. Question 21

Thet-test is used to:

Test the power of a statistical procedure

Test for a significant difference between the means of two samples

Examine the relationship between two variables

Examine the differences among three or more groups

1. Question 22

If you are conducting a study to examine relationships or predict the probability of an event, your study is based on which of the following theories?

Probability theory

Power

Causality

Decision theory

1. Question 23

Three or more groups are included in an analysis of variance (ANOVA), and the probability level (p) indicates that the null hypothesis should be rejected. Which of the following statements about this ANOVA is true?

The research can now tell which groups are statistically different from other groups

Specific post-hoc analyses should be done to determine where there are group differences

Each of the means is significantly different from every other one

It will be necessary to perform t-tests on each pair of means to determine which pair is (are) different.

1. Question 24

What level of data is defined as named, ranked and equidistant from an arbitrary zero point?

Interval

Ordinal

Nominal

Ratio

1. Question 25

You are reading a study with the following null hypothesis: There will be no difference in reported pain intensity levels among postoperative cardiovascular surgery patients between thosewho walk in cardiac rehabilitation centers and those who walk in their own homes. Which of the following statistical procedures would be appropriate for this study?

ANCOVA with place of exercise as the covariate

Regression Analysis

t-test

Chi square