Statistics Quiz

A school newspaper published an article that said approximately 55% of the school’s population enjoys Friday night Football games. The survey was given to a student-athlete club. Which statement is true?

• The findings in the article are valid because the population represents the feelings of a club.

• The findings in the article are accurate because the whole population was surveyed.

• The findings in the article are not valid because only student-athletes were surveyed.

• The findings in the article are not valid because 55% of the students were not surveyed.

Determine if each of the following represents a statistic of a parameter

Groups:

(a) Parameter

,

(b) Statistic

• Median price of a home in Murfreesboro

• Most popular pizza topping of students in Mrs. G's class

• The average height of high school basketball players surveyed

• The shoe size of 15 boys in Ms. Curtis' class

Which statistical method involves testing different assumptions under controlled conditions?

• Experiment

• Observational study

• Questionnaire

• Survey

Jorge measures his bedroom and rounds the measurements to be 20 ft. by 14 ft. What would be the maximum area of his bedroom and how much carpet should he purchase to carpet the room?

• 20 x 14; 280 square feet

• 19.5 x 13.5; 263.25 square feet

• 20.5 x 14.5; 297.25 square feet

• 20.4 x 14.4; 293.76 square feet

Mrs. Blair wants to survey students about a wide variety of matters. There are 2,257 students in the school, but she only has the time and resources to survey 80.

• Survey the first 80 students who arrive at school on a Tuesday

• Put all students' names in a hat and draw out 80 names to survey

• Go to gym class during 3rd period and ask for volunteers

• Offer students a $5 Starbucks gift card to complete the survey and survey the first 80 students who show up

Which method would be the best way to conduct an observational study to determine the effects of Vitamin C for preventing colds?

• Ask 100 people who consume Vitamin C if they got a cold.

• Divide 100 volunteers into two groups. Give one group Vitamin C and do not give the other group Vitamin C. Monitor who gets a cold.

• Interview 100 people and classify them as either never consuming Vitamin C, sometimes consuming Vitamin C, or consuming Vitamin C on a regular basis. Check for cold symptoms and analyze the results.

• Ask 100 people who had a cold last winter if they consumed Vitamin C on a regular basis and record the number.

Dollywood is wanting to conduct a survey about customer satisfaction. Which of the following survey methods should it use to reduce the chance of bias?

• Randomly select 150 visitors and ask them to rate their experience at the amusement park.

• Randomly select 200 visitors in the age group 20-30 and ask them to rate their experience at the park.

• Select the first 100 Gold Pass holders and ask them to rate their experience at the park.

• Randomly select 250 passengers in the age group 50-60 and ask them to rate their experience at the park.

River's new high school plans to choose a class color by the end of the month. River surveyed 100 students for their color preferences. Which statement best describes why River’s data is misleading?

• the population sample is not guaranteed to be in his class

• It doesn't give the percentage of each color

• It does not identify the age of the students surveyed

• the entire school population is not represented in the survey

Consumers who bought Dove were asked to respond to an internet survey comparing Dove to Olay. If 500 of the 700 people said they preferred Dove, what claim can the company make?

• 5 out of 7 people prefer Dove.

• More people use Dove than Olay.

• Any claim would not be accurate since the survey was given to Dove consumers.

• Any claim would not be accurate since it is likely that most respondents use Olay.

Two normal curves are shown below. Which statement comparing the standard deviations of the curves is true?

• The standard deviation of Curve B is larger than the standard deviation of Curve A.

• The standard deviation of Curve B is larger than the standard deviation of Curve C.

• The standard deviation of Curve A is equal to the standard deviation of Curve C.

• The standard deviation of Curve B is smaller than the standard deviation of Curve C.