Alg 4 Stats Chapter 1 Review

Which statement best characterizes the definitions of categorical and quantitative data?

• Quantitative data consist of numbers, whereas categorical data consist of names and labels that are not numeric.

• Quantitative data consist of numbers representing measurements or counts, whereas categorical data consist of names or labels.

• Quantitative data consist of values that can be arranged in order, whereas categorical data consist of values that cannot be arranged in order.

• Quantitative data have an uncountable number of possible values, whereas categorical data have a countable number of possible values.

The pie chart describes the distribution of favorite games of 400 high school students.    How many

students reported that Chess is their favorite game?

• 15

• 54

• 60

• 340

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CCSS.7.RP.A.2

CCSS.7.RP.A.3

The following dot plot shows data from the World Bank's 2012 report on access to electricity in 48 sub-Saharan African countries. Each dot represents one country.

Pick the true statement.

• The populations of four countries have more than 80% access to electricity.

• There are two countries for which 21% of the population has access to electricity.

• There are more countries whose populations have less than 10% access to electricity than countries whose populations have at least 70% access to electricity.

• There are three countries for which 56% of the population has access to electricity.

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CCSS.7.RP.A.2

CCSS.7.SP.A.1

CCSS.7.SP.A.2

You look at real estate ads for houses in Naples, Florida. There are many houses ranging from $200,000 to $500,000 in price. The few houses on the water, however, are priced up to $15 million. The distribution of house prices will be...

• roughly symmetric

• bimodal

• skewed to the right

• skewed to the left

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CCSS.HSS.ID.A.2

CCSS.HSS.ID.A.3

Students in a high school statistics class responded to a survey designed by their teacher. One of the survey questions was “How much sleep did you get last night?” Here is a dot plot of the data:

Describe the shape of the distribution.

• Fairly symmetric and unimodal with a single peak at 7.

• Left skewed and bimodal with a single peak at 7.

• Right skewed and bimodal with a single peak at 7.

• Symmetric with peaks at 6 and 7.

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CCSS.HSS.ID.A.1

CCSS.HSS.ID.A.2

CCSS.HSS.ID.A.3

Beans and other legumes are a great source of protein. The following data give the protein content of 30 different varieties of beans, in grams per 100 grams of cooked beans.

According to this stem plot, what percent of beans have over 9.0 g of protein?

• 7%

• 23%

• 33%

• 77%

Suppose that a polling company surveyed 600 people about how much time they spend using the Internet each week. The results of this survey were compiled and used to create this relative frequency histogram.

Assume that all percentages shown in the histogram are whole numbers. Each of the bars in this histogram includes only the left endpoint of the class except for the last bar, which also includes the right endpoint.

What percentage of respondents said that they use the Internet less than 12 hours per week?

• 80%

• 77%

• 65%

• 62%

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CCSS.7.RP.A.3

CCSS.7.SP.A.1

CCSS.7.SP.A.2

Here are data on the resting pulse rates (in beats per minute) of 19 middle school students:

What is the mean pulse rate?

• 79.06 bpm

• 81.21 bpm

• 82 bpm

• 87 bpm

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CCSS.6.SP.A.3

CCSS.6.SP.B.5

A small town needed to raise money to clean up a local polluted stream. The city council decided to hold a wing-eating contest to raise the money. The distribution of the number of wings eaten by competitors is shown.

Which measure of central tendency would best describe this data?

• the median

• the mean

• the mode

• the IQR

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CCSS.7.SP.B.4

The figure displays computer output for data on the amount spent by 50 grocery shoppers.

Choose the correct interpretation of the standard deviation.

• The amount of money spent by these 50 shoppers typically varied by about $21.70 from the mean of $34.70.

• You can expect the amount spent by these 50 shoppers to fluctuate between $13.00 and $56.40.

• There was a lot of variability in the amount of money spent by the shoppers at this grocery store!

• The amount of money spent by these 50 shoppers always varies by about $21.70 from the mean of $34.70.

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CCSS.7.SP.B.4