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Statistical Inferences

Authored by Anthony Clark

Mathematics

7th Grade

CCSS covered

Statistical Inferences
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20 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A recent survey found that out of 400 random American adults, 89% pay their bills on time. The margin of error in this survey was 2%. What is the interval of values in which the truth is likely found?

89% - 91%

87% - 89%

87% - 91%

388 - 402

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A recent survey of 2000 high schoolers found that 80% use their phones more than 4 hours a day on average, with a standard deviation of 1%. What is the interval for which we could expect to find the truth mean of the population?

2%

78% - 82%

93% - 97%

82%

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

Find the area of the shaded region.

16%

84%

68%

34%

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

A difference of -9 degrees is likely ______

by grouping

by treatment

5.

MULTIPLE SELECT QUESTION

1 min • 1 pt

Media Image

A representative sample of 80 customers in a clothing store was surveyed about how they paid for their purchases. The table shows the responses. Based on the results, which of the following are valid inferences. Select all that apply.

Tomorrow, 8 out of the first 80 customers will for sure pay with a gift card.

In a group of 40 customers, it is expected that about 10 will pay with cash.

About 0.3, or 30%, of all the store's customers will pay with a credit card.

A sample of 100 customers would provide less reliable data.

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

The manager of a music store surveyed a random sample of customer who shop in the store about their favorite type of music. The table shows the number of customers who selected each type of music. Based on the information in the table, which inference about the favorite type of music of all the customers who shop in the music store appears to be valid?

They are certain to select rock or pop music.

They are less likely to select country or rap music than rock music.

They are more likely to select country music than jazz, classical, or rap music.

They are certain to select any type of music other than jazz music.

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

The table shows the monthly sales at a pizza parlor for a 6-month period. Which statement is the best inference that can be made from the table?

January had the lowest sales.

The period with the greatest increase in monthly sales was from May to June.

Sales for July will be greater than $10,000.

The sales will drop over the next 2-month period.

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