Questions: The data sets give the number of platinum albums for the five male artists and the five female artists in a country with the most platinum albums through a recent year. (Platinum albums sell one million units or more.) Complete parts (a) through (d) below. Male Artists with the most platinum albums Artist Platinum Albums Artist 1 142 Artist 2 97 Artist 3 85 Artist 4 82 Artist 5 69 Female Artists with the most platinum albums Artist Platinum Albums Artist 1 67 Artist 2 62 Artist 3 56 Artist 4 56 Artist 5 46 a. Without calculating, which data set has the greater mean number of platinum albums? Explain your answer. A. Female artists have the greater mean number of platinum albums because all of the data items for the women are less than the greatest data item for the men. B. Female artists have the greater mean number of platinum albums because all of the data items for the women are greater than the greatest data item for the men. C. Male artists have the greater mean number of platinum albums because all of the data items for the men are greater than the greatest data item for the women. D. Male artists have the greater mean number of platinum albums because all of the data items for the men are less than the greatest data item for the women. b. Verify your conjecture from part (a) by calculating the mean number of platinum albums for each data set. Mean (Male artists) =95 Mean (Female artists) =57.4 (Round to two decimal places as needed.) c. Without calculating, which data set has the greater standard deviation? Explain your answer. A. Male artists have the greater standard deviation because there is a greater spread in the data for men. B. Male artists have the greater standard deviation because there is a lower spread in the data for men. C. Female artists have the greater standard deviation because there is a greater spread in the data for women. D. Female artists have the greater standard deviation because there is a lower spread in the data for women.

The data sets give the number of platinum albums for the five male artists and the five female artists in a country with the most platinum albums through a recent year. (Platinum albums sell one million units or more.) Complete parts (a) through (d) below.

Male Artists with the most platinum albums
Artist  Platinum Albums
Artist 1  142
Artist 2  97
Artist 3  85
Artist 4  82
Artist 5  69

Female Artists with the most platinum albums
Artist  Platinum Albums
Artist 1  67
Artist 2  62
Artist 3  56
Artist 4  56
Artist 5  46

a. Without calculating, which data set has the greater mean number of platinum albums? Explain your answer.
A. Female artists have the greater mean number of platinum albums because all of the data items for the women are less than the greatest data item for the men.
B. Female artists have the greater mean number of platinum albums because all of the data items for the women are greater than the greatest data item for the men.
C. Male artists have the greater mean number of platinum albums because all of the data items for the men are greater than the greatest data item for the women.
D. Male artists have the greater mean number of platinum albums because all of the data items for the men are less than the greatest data item for the women.

b. Verify your conjecture from part (a) by calculating the mean number of platinum albums for each data set.

Mean (Male artists) =95
Mean (Female artists) =57.4
(Round to two decimal places as needed.)

c. Without calculating, which data set has the greater standard deviation? Explain your answer.
A. Male artists have the greater standard deviation because there is a greater spread in the data for men.
B. Male artists have the greater standard deviation because there is a lower spread in the data for men.
C. Female artists have the greater standard deviation because there is a greater spread in the data for women.
D. Female artists have the greater standard deviation because there is a lower spread in the data for women.
Transcript text: The data sets give the number of platinum albums for the five male artists and the five female artists in a country with the most platinum albums through a recent year. (Platinum albums sell one million units or more.) Complete parts (a) through (d) below. Male Artists with the most platinum albums Artist & Platinum Albums Artist 1 & 142 Artist 2 & 97 Artist 3 & 85 Artist 4 & 82 Artist 5 & 69 Female Artists with the most platinum albums Artist & Platinum Albums Artist 1 & 67 Artist 2 & 62 Artist 3 & 56 Artist 4 & 56 Artist 5 & 46 a. Without calculating, which data set has the greater mean number of platinum albums? Explain your answer. A. Female artists have the greater mean number of platinum albums because all of the data items for the women are less than the greatest data item for the men. B. Female artists have the greater mean number of platinum albums because all of the data items for the women are greater than the greatest data item for the men. C. Male artists have the greater mean number of platinum albums because all of the data items for the men are greater than the greatest data item for the women. D. Male artists have the greater mean number of platinum albums because all of the data items for the men are less than the greatest data item for the women. b. Verify your conjecture from part (a) by calculating the mean number of platinum albums for each data set. Mean (Male artists) =95 Mean (Female artists) =57.4 (Round to two decimal places as needed.) c. Without calculating, which data set has the greater standard deviation? Explain your answer. A. Male artists have the greater standard deviation because there is a greater spread in the data for men. B. Male artists have the greater standard deviation because there is a lower spread in the data for men. C. Female artists have the greater standard deviation because there is a greater spread in the data for women. D. Female artists have the greater standard deviation because there is a lower spread in the data for women.
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Solution

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Solution Steps

Step 1: Mean Calculation for Male Artists

To calculate the mean number of platinum albums for male artists, we use the formula:

\[ \mu = \frac{\sum_{i=1}^N x_i}{N} \]

Substituting the values:

\[ \mu = \frac{142 + 97 + 85 + 82 + 69}{5} = \frac{475}{5} = 95.0 \]

Thus, the mean for male artists is \( \mu = 95.0 \).

Step 2: Mean Calculation for Female Artists

Similarly, we calculate the mean for female artists:

\[ \mu = \frac{\sum_{i=1}^N x_i}{N} \]

Substituting the values:

\[ \mu = \frac{67 + 62 + 56 + 56 + 46}{5} = \frac{287}{5} = 57.4 \]

Thus, the mean for female artists is \( \mu = 57.4 \).

Step 3: Standard Deviation Calculation for Male Artists

The variance \( \sigma^2 \) for male artists is calculated as follows:

\[ \sigma^2 = \frac{\sum (x_i - \mu)^2}{n} \]

Substituting the values:

\[ \sigma^2 = 631.6 \]

The standard deviation \( \sigma \) is then:

\[ \sigma = \sqrt{631.6} \approx 25.13 \]

Thus, the standard deviation for male artists is \( \sigma \approx 25.13 \).

Step 4: Standard Deviation Calculation for Female Artists

The variance \( \sigma^2 \) for female artists is calculated similarly:

\[ \sigma^2 = \frac{\sum (x_i - \mu)^2}{n} \]

Substituting the values:

\[ \sigma^2 = 49.44 \]

The standard deviation \( \sigma \) is then:

\[ \sigma = \sqrt{49.44} \approx 7.03 \]

Thus, the standard deviation for female artists is \( \sigma \approx 7.03 \).

Final Answer

  • Mean (Male artists) = \( 95.0 \)
  • Mean (Female artists) = \( 57.4 \)
  • Standard Deviation (Male artists) = \( 25.13 \)
  • Standard Deviation (Female artists) = \( 7.03 \)

The answer to part (a) is C. Male artists have the greater mean number of platinum albums because all of the data items for the men are greater than the greatest data item for the women.

The answer to part (c) is A. Male artists have the greater standard deviation because there is a greater spread in the data for men.

Thus, the final boxed answers are:

\[ \boxed{\text{Mean (Male artists) = 95.0, Mean (Female artists) = 57.4}} \] \[ \boxed{\text{Standard Deviation (Male artists) = 25.13, Standard Deviation (Female artists) = 7.03}} \] \[ \boxed{\text{Answer to part (a) = C, Answer to part (c) = A}} \]

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