Review Statistics

Use the table to predict the number of students out of 528 that would say each of the following was their least favorite chore. Wash dishes.

• 66 students

• 88 students

• 110 students

• 154 students

The results of a survey asking teens their favorite type of book to read is shown.

Out of 250 teens, predict about how many would choose adventure as their favorite type of book to read.

• 33 teens

• 63 teens

• 93 teens

• 187 teens

Determine if the conclusion is valid. Justify your answer.

To determine the most common injury cared for in an emergency room, a reporter goes to the same hospital every afternoon for one month during the summer and observes people entering the emergency room. She concludes that second degree sunburn is the most common injury.

• valid; This is an unbiased random sample.

• not valid; This is an unbiased random sample.

• not valid; This is a biased voluntary sample

• not valid; This is a biased convenience sample.

Determine if the conclusion is valid. Justify your answer.

To evaluate the integrity of underground water lines, the department of public works randomly selects 20 sites in the city to unearth and observe the water lines. At 5 of the sites, the water lines needed repair. The department of public works concludes that about one-fourth of underground water lines throughout the city need repair.

• valid; This is an unbiased random sample.

• valid; This is a biased random sample.

• valid; This is an unbiased voluntary response sample.

• not valid; This is a biased convenience sample

A survey is to be conducted to determine the reasons dental patients are hesitant to go to the dentist. Describe the sample and explain why the sampling method might not be valid.

Adults that are randomly selected from an office complex are asked to go online and fill out a questionnaire.

• convenience sample; Adults may not respond

• voluntary response sample; Adults may not respond.

• simple random sample; Adults may not respond.

• systematic random sample; Adults may not respond

The double dot plot shows the weight in pounds of several house cats of several house cats and small dogs.

• The mean for the house cat data is 9 with a range of 6. The mean for the small dog data is 11 with a range of 4. Small dogs weigh more with less variation.

• The mean for the house cat data is 11 with a range of 4. The mean for the small dog data is 9 with a range of 6. House cats weigh more with less variation.

• The mean for the house cat data is 11 with a range of 4. The mean for the small dog data is 9 with a range of 6. House cats weigh more with more variation.

• The mean for the house cat data is 11 with a range of 4. The mean for the dog data is 9 with a range of 6. House cats weigh more with more variation.

The double dot plot shows the gas mileage, in miles per gallon, for several cars and SUVs.

• The median for the SUV data is 25 with a variation (IQR) of 4. The median for the var data is 20 with a variation of 2. SUVS have greater gas mileage with a greater variation.

• The median for the SUV data is 20 with a variation of 2. the median for the car data is 25 with a variation of 4. SUVS have a greater gas mileage with a greater variation.

• The median for the SUV data is 20 with a variation of 2. The median for the car data is 25 with a variation of 4. Cars have a greater gas mileage with a greater variation.

• The median for the SUV data is 20 with a variation of 2. The median for the car data is 25 with a variation of 4. Cars have a greater gas mileage with a less variation.

The double box plot shows the number of Calories per serving for various fruits and vegetables.

• The median for the fruit data is 100 with variation of 75. The median for the vegetable data is 50 with a variation of 50. Fruits have a higher number of Calories with a greater variation.

• The median for the fruit data is 50 with a variation of 50. The median for the vegetable data is 100 with a variation of 75. Vegetables have a higher number of Calories with a greater variation.

• The median for the fruit data is 100 with a variation of 75. The median for the vegetable data is 50 with a variation of 50. Vegetables have a higher number of Calories with a greater variation.

• The median for the fruit data is 100 with a variation of 75. The median for the vegetable data is 50 with a variation of 50. Fruits have a higher number of Calories with less variation.

Carrie is comparing the growth of plants under natural and artificial light sources.

Part A Use the measures of center from the box plots to make an inference about the data.

• On average group Q has a greater growth of plants under natural and artificial light sources.

• The sets have the same variability related to the growth of plants under natural and artificial light sources.

Tags

CCSS.7.SP.B.4

Carrie is comparing the growth of plants under natural and artificial light sources.

Part B Use the box plots to make an inference using the variability of the data.

• On average group Q has a greater growth of plants under natural and artificial light sources.

• The sets have the same variability related to the growth of plants under natural and artificial light sources.