2.10: Unit Test

What is the best way to gather information for each of the scenarios? Select Survey, Experiment, or Observational Study for each scenario. Survey Experiment Observational Study A coach wants to know who his fastest runner is. A coach wants to know how many hours of sleep each member of the team gets before a meet. A coach wants to know the effect of drinking a certain sports drink during an intense practice. A coach wants to know how losing affects the team.

Experiment Survey Experiment Observational Study

A number generator was used to simulate the percentage of people in a town who belong to the community fitness center. The process simulates randomly selecting 100 people from the town and was repeated 20 times. The percentage of people who belong to the community fitness center in the town is shown in the dot plot. Which statement is most likely true about the population of the town? Most likely, 50% of the town skateboards. Most likely 70% to 85% of the town belongs to the fitness center. About 85% of the town most likely belongs to the fitness center. Most likely, 30% of the town does not belong to the fitness center.

Most likely 70% to 85% of the town belongs to the fitness center.

A drawer contains black socks and white socks. 20% of the socks are black socks. A number generator simulates randomly selecting 10 socks from the drawer. The number generator is used 10 times and the number of black socks in each trial is shown in the line plot. https://static.k12.com/nextgen_media/assets/8080410-NG_AL2_SemA_02_UT_02.png Which description is correct about the number generator being fair or not? Yes, the number generator is fair. It picked the approximate percentage of black socks most of the time. Yes, the number generator is fair. It only picked black socks half of the time. No, the number generator is not fair. In two experiments, it picked black socks 50% of the time two times. No, the number generator is not fair. The correct percentage of black socks was not chosen at all.

No, the number generator is not fair. The correct percentage of black socks was not chosen at all.

What is the best way to describe how data is being gathered for each of the scenarios? Select Survey, Experiment, or Observational Study for each scenario. Survey Experiment Observational Study The subjects assign themselves to a treatment group. The subjects have to give responses to a set of questions. The subjects are assigned to a treatment group by the investigator. Data is collected by watching what happens to a group who has chosen a certain treatment.

Observational Study Survey Experiment Observational Study

Select Parameter or Statistic to classify each statement. Information Parameter Statistic 85% of the golf team has scored lower than 80 strokes. According to the survey, the each member of the soccer league has an average number of 2 jerseys. Of the 100 swim teams surveyed across America, 23 of them practice 10 hours a week. A sample of football players suggests that 26% of football players run on weekends. The soccer team has won 3 games for every 5 they have played. 78% of those surveyed at the fair bought popcorn.

Parameter Statistic Parameter Statistic Parameter Statistic

The results of a poll show that the percent of people who want a new restaurant is in the interval (42%, 78%). There are 128,523 people in the city. What is the point estimate for the percent who want the restaurant? What is the poll's margin of error? What is the interval for the number of people who are likely to want this restaurant in their city? Enter your answers in the boxes. Round to the nearest person.

Point estimate: 60% Margin of error: ±± 18% Interval: (53,980 100,248 )

A neighborhood organization wants to know what percent of households want to have a community vegetable garden. The organization plans to survey a random sample of 25 households. What is the best way to randomly choose the 25 households? Count every 5th house on the longest street. Randomly assign each household a number. Use a random number generator to generate 25 numbers. Ask for volunteers. Ask the households nearest to the proposed site of the vegetable garden.

Randomly assign each household a number. Use a random number generator to generate 25 numbers.

A football coach wants to see how many laps his players can run in 15 minutes. During a non-mandatory meeting, the coach asks for volunteers on his team to do the experiment. In what way(s) is randomization not applied in this situation? Select each correct answer. The coach is only observing football players. The coach cannot select those he observes. The coach is observing only football players attending the meeting. The football players are volunteering for the test. There is no selection process.

The coach is observing only football players attending the meeting. The football players are volunteering for the test. There is no selection process.

The standard deviation for the data in the table is 3.46. 105 104 110 112 114 106 108 109 What is the margin of error? What is the interval estimate? Round to two decimal places. Enter your answers in the boxes.

The margin of error is ±± 6.92 The interval estimate is (101.58 115.42) .

Visitors to a public library were asked how many miles they lived from the library. The table shows their responses. 1.5 2.3 3.5 2 1.8 1.8 1.9 0.5 2.5 2.4 4.8 3.7 0.6 2 2.4 2.5 1.5 0.5 1.8 0.8 Of these visitors, the first 10 people to check out books lived the following miles from the library. 0.5 1.8 0.8 1.8 3.5 4.8 0.6 2 1.5 0.5 What are the population and sample means for the data in the tables? Enter your answers in the boxes. Round to the nearest tenth.

The population mean is 2.0 The sample mean is 1.8

A grocery store surveyed 125 random customers who bought fruits. Participants were asked the question, "Would you like the store to provide more fresh vegetables or more fresh fruits?" A report of the survey results stated that customers would prefer the store to provide more fresh fruits than fresh vegetables. Select all statements that correctly evaluate the report. The sample is biased because it does not represent the population. The question is biased towards a response of wanting more fresh fruits. The sample is not biased. The question is not biased. The question is biased towards a response of wanting more fresh vegetables.

The sample is biased because it does not represent the population. The question is not biased.

Suppose 1/5 of all widgets produced at a factory are defective. The following simulations demonstrate how widgets can be randomly chosen and then recorded as working or defective. Which answer is the the best simulation for this scenario? Flip a coin 50 times. Of the 50 flips, the coin lands on heads 10 times and tails 50 times. Flip a coin 100 times. Of the 100 flips, the coin lands on heads 20 times and tails 80 times. Use a spinner that is divided into 5 equal sectors numbered 1 to 5. Spin the spinner 100 times. Of the 100 spins, the spinner lands on 1 a total of 20 times and on the other numbers 80 times. Use a spinner that is divided into 2 equal halves numbered 1 and 2. Spin the spinner 20 times. Of the 20 spins, the spinner lands on 1 a total of 5 times and on 2 a total of 15 times.

Use a spinner that is divided into 5 equal sectors numbered 1 to 5. Spin the spinner 100 times. Of the 100 spins, the spinner lands on 1 a total of 20 times and on the other numbers 80 times.