Business STAT Test 1

Select the graph that best illustrates the following distribution shape: Skewed to the left

(long tail on left side)

Consider the following frequency table representing the distribution of hourly wages for first jobs of a certain population. 1. Determine the cumulative frequency for the second class. 2. Determine the cumulative frequency for the fourth class.

1. 22 2. 30

The following histogram represents the distribution of scores on a ten-point quiz. 1. Which score has the highest frequency? 2. What is the frequency corresponding to a score of 7? 3. What is the total number of people who made a score between 8 and 10 inclusive?

1. 9 2. 13 3. 29

The following stem-and-leaf plot represents the distribution of weights for a group of people. 1. What is the weight of the lightest person in the group? 2. How many people weigh in the range from 110 to 150 inclusive? 3. What is the weight of the heaviest person in the range 110 to 119 inclusive?

1. 92 2. 22 3. 119

The following bar graph represents the number of dogs and cats treated by a local vet during one week. 1. Were there more dogs or more cats treated during the week? 2. On which day was the greatest total number of cats and dogs treated?

1. More dogs were treated during the week than cats 2. Monday

For the following situation determine what type of sampling was used. The mayor of a certain city would like to do a poll on the approval rating of a new program that has been passed. Each voting district in the area is put into one of four groups. One of the four groups is randomly selected and all households in that group are sent a survey.

Cluster sample

Determine whether the statement describes a descriptive or inferential statistic. A survey of 459 people revealed that 62% eat while they drive; therefore it can be assumed that 62% of the U.S. population eats while they drive.

Inferential Statistic

Determine if the numerical value describes a population parameter or a sample statistic. The average number of hours students in your statistics class study per week is 12.2

Population Parameter

Classify the following data. Indicate whether the data is qualitative or quantitative, indicate whether the data is discrete, continuous, or neither, and indicate the level of measurement for the data. Survey responses to the question "What is the gender of your first child?" 1) Male 2) Female

Qualitative, Neither, Nominal

Classify the following data. Indicate whether the data is qualitative or quantitative, indicate whether the data is discrete, continuous, or neither, and indicate the level of measurement for the data. A supervisor must give a summary evaluation rating from among the choices given below: 1) Poor 2) Fair 3) Good 4) Very good 5) Excellent

Qualitative, Neither, Ordinal

Classify the following data. Indicate whether the data is qualitative or quantitative, indicate whether the data is discrete, continuous, or neither, and indicate the level of measurement for the data. The heights of 48 randomly selected female students.

Quantitative, Continuous, Ratio

Classify the following data. Indicate whether the data is qualitative or quantitative, indicate whether the data is discrete, continuous, or neither, and indicate the level of measurement for the data. Birth years of each person in your family.

Quantitative, Discreme, Interval

Determine if the numerical value describes a parameter or a statistic. A survey of 866 people in the U.S. revealed that 65% of those surveyed eat while they drive.

Sample Statistic

For the following situation determine what type of sampling was used. A research company believes teens today are getting less than the recommended hours of sleep. The company takes a list of 2000 teen volunteers and assigns each volunteer a number. A random number generator is used to select 350 individuals to take part in a sleep survey.

Simple random sample

For the following situation determine what type of sampling was used. A research company believes teens today are getting less than the recommended hours of sleep. The company takes a list of 2000 teen volunteers and puts the teens into groups based on which area of the country they live in. The company randomly selects 50 teens from each region to take part in the sleep study.

Stratified random sample

Identify the population being studied. The number of times 12 out of 31 students on your floor order pizza in a week.

The 31 students on your floor

Identify the sample chosen for the study. The ages of a sample of 32 professors at the local college.

The 32 professors at the local college

In a ______________ experiment, neither clinicians nor participants know whether the participant is in the control group or the treatment group.

double blind