BUS 5413 Statistics Test 1
Saved
If Σ(X – M)2 = 235, and n = 29, what is s?
Question 1 options:
| a. 8.10 | |
| b. 8.39 | |
| c. 2.90 | |
| d. 43.64 |
Saved
What is the standard deviation for the following set of scores: 10, 15, 12, 18, 19, 16, 12?
Question 2 options:
| a. 3.36 | |
| b. 11.29 | |
| c. 6.47 | |
| d. 17.78 |
Saved
What is the frequency distribution that shows frequencies for class intervals, along with the cumulative frequency for each?
Question 3 options:
| a. Frequency distribution | |
| b. Frequency polygon | |
| c. Cumulative frequency distribution | |
| d. Midpoint |
Saved
In order to say that a distribution is positively skewed, which of the following must be true?
Question 4 options:
| a. Right tail must be longer than left | |
| b. Right tail must be shorter than left | |
| c. Right and left tail must be equal | |
| d. Curve must be bell shaped |
Saved
Which of the following are used to define the percentage of cases equal to and below a certain point in a distribution of scores?
Question 5 options:
| a. T scores | |
| b. Q points | |
| c. Standard scores | |
| d. Percentile ranks |
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If the mean = 34, and the median = 25, then what can be said of the distribution?
Question 6 options:
| a. Positively skewed | |
| b. Negatively skewed | |
| c. Inversely skewed | |
| d. Symmetrical |
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More is more; the more functions, features, and so forth you can include on a graph, the better.
Question 7 options:
| a. True | |
| b. False |
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The sum of the absolute value of the deviations from the mean divided by the number of scores is equal to the _______.
Question 8 options:
| a. mean | |
| b. standard deviation | |
| c. mean deviation | |
| d. variance |
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What do you need to calculate first before calculating skewness?
Question 9 options:
| a. Mean and median | |
| b. Median and mode | |
| c. Mode and mean | |
| d. Mode and variance |
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Your current exam mean is 97.2. If you receive a 99 on the next exam, this will ____ your mean.
Question 10 options:
| a. increase | |
| b. decrease | |
| c. have no effect on | |
| d. both increase and decrease |
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Which of the following represents a bimodal distribution?
Question 11 options:
| a. 23 males and 14 females | |
| b. 43 New Yorkers, 14 Kentuckians, and 7 Wyomingites | |
| c. 23 professors and 22 researchers | |
| d. 14 individuals with blonde hair and 8 individuals with brown hair |
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Two people are given the same set of 20 numbers, and they both use Excel to compute the standard deviation. However, one person gets a value of 2.4, and the other gets a value of 2.5. Both people insist that they used the standard deviation function in Excel to get their answer. If both people are telling the truth, what probably happened?
Question 12 options:
| a. Different versions of Excel | |
| b. Using STDEV.S versus using STDEV.P | |
| c. One person mistakenly computed the variance | |
| d. Rounding difference due to a rounding preference setting in Excel |
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If you were interested in tracking your GPA during the time you are in graduate school, which of the following might you use?
Question 13 options:
| a. Bar chart | |
| b. Line graph | |
| c. Pie chart | |
| d. Histogram |
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As your sample size grows larger, the n – 1 adjustment for the standard deviation _____.
Question 14 options:
| a. has a greater impact on your calculation | |
| b. has a smaller impact on your calculation | |
| c. does not vary | |
| d. cannot be determined |
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The variance of a group of scores is 4. What is the standard deviation?
Question 15 options:
| a. 3.5 | |
| b. 18 | |
| c. 2 | |
| d. 16 |
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Which of the following will give you a visual view when creating a histogram in Excel?
Question 16 options:
| a. Input range | |
| b. Output range | |
| c. Chart Output options | |
| d. Cumulative Percentage options |
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If the mean of a set of scores is greater than the median, what can be said about the distribu-tion?
Question 17 options:
| a. Negatively skewed | |
| b. Positively skewed | |
| c. Leptokurtic | |
| d. Platykurtic |
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If the mean = 12, and the median = 21, then what can be said of the distribution?
Question 18 options:
| a. Positively skewed | |
| b. Negatively skewed | |
| c. Inversely skewed | |
| d. Symmetrical |
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A distribution of scores in which almost the entire class scored very low but a few students scored fairly high would be _______.
Question 19 options:
| a. positively skewed | |
| b. negatively skewed | |
| c. unskewed | |
| d. normally distributed |
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If you wanted to examine the proportion of students in this class who are male compared to female, which of the following might you use?
Question 20 options:
| a. Ogive | |
| b. Line graph | |
| c. Pie chart | |
| d. Frequency polygon |
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Imagine that you run a pizza restaurant chain that serves pizza slices to millions of people each day. You want to know if customers are getting the same-sized slice of pizza whenever they order. You have a random sample of slices measured for area. Which measure will be most useful for understanding if the size of slices vary by a lot or by a little?
Question 21 options:
| a. Mean | |
| b. Standard deviation | |
| c. Variance | |
| d. Range |
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What is obtained by taking the square ROOT of the variance?
Question 22 options:
| a. Standard deviation | |
| b. Mean | |
| c. Mode | |
| d. Mean deviation |
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If you have a distribution of 100 scores, and you want 20 intervals, what should be the size of your class interval?
Question 23 options:
| a. 50 | |
| b. 25 | |
| c. 10 | |
| d. 5 |
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If you have a distribution of 50 scores, and you want 10 intervals, what should be the size of your class interval?
Question 24 options:
| a. 50 | |
| b. 25 | |
| c. 10 | |
| d. 5 |
Saved
In order to say that a distribution is negatively skewed, which of the following must be true?
Question 25 options:
| a. Right tail must be longer than the left | |
| b. Left tail must be longer than the right | |
| c. Both tails must be of equal length | |
| d. The curve must be bell shaped |
Saved
What is the first step to create a chart in Excel?
Question 26 options:
| a. Highlight the data | |
| b. Click the Insert tab | |
| c. Select the type of chart | |
| d. Link the data |
Solutions – BUS 5413 Statistics Test 1
Question 1 (1 point)
If Σ(X – M)2 = 235, and n = 29, what is s?
Question 1 options:
| a. 8.10 |
| b. 8.39 |
| c. 2.90 |
| d. 43.64 |
What is the standard deviation for the following set of scores: 10, 15, 12, 18, 19, 16, 12?
Question 2 options:
| a. 3.36 |
| b. 11.29 |
| c. 6.47 |
| d. 17.78 |
What is the frequency distribution that shows frequencies for class intervals, along with the cumulative frequency for each?
Question 3 options:
| a. Frequency distribution |
| b. Frequency polygon |
| c. Cumulative frequency distribution |
| d. Midpoint |
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