Explain the difference between descriptive and inferential samples.
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Instructions for class assignment: Watch videos and read Urdan chapters 1 through 4. Complete the attached quiz.
- Define the following in one phrase:
- Categorical Data & give an example of how it is displayed and what type of variable represents this data: _________________________________________________________
- Quantitative (Numerical) Data & give an example of how it is displayed and what type of variable represents this data:
____________________________________________________________
- Explain the difference between descriptive and inferential samples:
____________________________________________________________
- Answer the following questions by highlighting the answer in yellow:
- What is the definition of a population?
a. | the objects (people, animals, etc.) measured in an experiment |
b. | objects that share characteristics defined by a researcher |
c. | objects that share characteristics predicted by a study |
d. | objects selected randomly |
- Which of the following is the best description of the purpose of a sample?
a. | to provide results that a researcher can generalize to a population |
b. | to provide data that a researcher can generalize to another sample |
c. | to define who can and cannot be a research participant |
d. | to provide access to research subjects |
- Which of the following could be a population of interest in a study?
a. | women age 50 to 79 |
b. | women age 50 to 79 living in the United States |
c. | women age 50 to 79 living in the United States who have at least one child |
d. | Any of the above could be a population. |
- Round 14.575 to two decimal places.
a. | 14.55 | c. | 14.57 |
b. | 14.56 | d. | 14.58 |
- What is a distribution?
a. | a data set with a large range |
b. | a data set that has been sorted |
c. | the whole set of values for one variable in a data set |
d. | the whole set of variables in a data set |
- What is frequency?
a. | a tally of the number of different values a variable can take |
b. | a tally of the number of occurrences of one value in a distribution |
c. | a value that occurs often in the distribution |
d. | a count of the total number of subjects represented in a distribution |
- Calculate the mean for these data: 2, 2, 3, 3, 4, 6
a. | 3.00 | c. | 3.50 |
b. | 3.33 | d. | none of the above |
- In the following data set, which score is the outlier?
27, 34, 36, 38, 74
a. | 27 | c. | 38 |
b. | 34 | d. | 74 |
- Find the median for this data set: 7, 8, 35, 36, 41, 90
a. | 35 | c. | 36 |
b. | 35.5 | d. | 36.5 |
- What is the first thing you would do to calculate the median for these data?
1, 6, 13, 2, 5, 3, 27, 4
a. | Add the numbers together. |
b. | Arrange the numbers in order. |
c. | Count to find sample size. |
d. | Decide whether there are an even or odd number. |
- In the formula for the mean, , what does mean?
a. | sum of | c. | center of |
b. | son of | d. | score of |
- Calculate the most appropriate measure of central tendency for this data set of interval level numbers: 1, 1, 3, 5, 30
a. | median = 3 |
b. | mean = 8 |
c. | mode = 1 |
d. | Any of the above |
- What percentile rank is the same as the median, and why?
a. | 49th: different number of scores above and below |
b. | 49th: equal number of scores above and below |
c. | 50th: different number of scores above and below |
d. | 50th: equal number of scores above and below |
- Identify the mode in the following data set: 2, 3, 5, 8
a. | 2 | c. | 5 |
b. | 3 | d. | There is no mode. |
- Standard deviation can be defined as an averge deviation between the scores and the mean in the distribution
- True
- False
- Why should you wait until the end of your calculations and round your final answer?
- Rounding as you go takes more time than it is worth.
- Calculators can carry a lot of digits with no trouble.
- Rounding as you go may make the final answer less accurate.
- You would get the same result either way, so wait till the end.
- Tom was reading a report of a study and was trying to remember the difference between the small n and capital N. This is what he remembered: ‘n’ is the number of scores in the sample, and ‘N’ is the number of scores in the population.
- True
- False
- Range is basically a concept about
a. | score meaning. | c. | score frequency. |
b. | score distance. | d. | score importance. |
- What is the range of the following data? 77, 89, 92, 92, 98
a. | 21 | c. | 77 |
b. | 22 | d. | 98 |
- What kinds of numbers result from calculating variance?
a. | non-negative numbers | c. | non-positive numbers |
b. | non-zero numbers | d. | negative numbers |
- In the formula for estimated population variance, why is the denominator n–1?
a. | to correct for sampling limitations |
b. | to make the sample as large as the population |
c. | to put the variance in the same metric as the scores |
d. | to increase the range |
- Which of the following distributions is most likely to be negatively skewed?
a. | mile running speeds for a random sample of people |
b. | mile running speeds for couch potatoes |
c. | mile running speeds for Olympic runners |
d. | mile running speeds for people who attend the Olympics |
- A normal distribution looks most like which of the following shapes?
a. | a bell |
b. | a top hat |
c. | profile of a mountain range with many mountains |
d. | profile of a camel with two humps |
- Kurtosis refers to a distribution’s
a. | outliers. | c. | height. |
b. | modality. | d. | tilt. |
- When a distribution has a peak that is higher than that found in a normal, bell-shaped distribution, it is called leptokurtic.
- True
- False
- A political candidate attracted mostly older voters. Which measure of central tendency would the press probably report in articles about his popularity?
- mean c. mode
- median d. none of the above
- A survey question asked students to respond on a scale of 1 (strongly disagree) through 5 (strongly agree) to an opinion question. Use the graph to describe the results. Select all that apply.
a. | The most popular response was strongly agree. |
b. | Most people agreed or strongly agreed with the statement. |
c. | Very few people were neutral. |
d. | About the same amount strongly agreed and strongly disagreed. |
e. | The distribution is negatively skewed. |
f. | The distribution is positively skewed. |
- 28. The level of significance usually set in nursing studies is at:
- (p < 0.5)
- (p < .05)
- (p < .03)
- (p < .01)
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