MA Chapter 2

The College Board originally scaled SAT scores so that the scores for each section were approximately normally distributed with a mean of 500 and a standard deviation of 100. Assuming SAT scores follow a bell-shaped distribution; use the empirical rule to find the percent of students who scored more than 600. Feedback: Correct. The z-score for this situation is (700 - 600) / 100 = 1. Recall that 68% of observations will fall within 1 standard deviation of mean. This means that 16% of observations will fall above 1 standard deviation and 16% of observations will fall below 1 standard deviation. This question asks for the percent of students who scored more than 600 (above 1 standard deviation). The correct answer is 16%.

16%

The College Board reported that in 2014, the mean Math Level 2 SAT subject test score was 686 with a standard deviation of 96. Assuming scores follow a bell-shaped distribution; use the empirical rule to find the percent of students who scored less than 494. Feedback: Incorrect. The z-score for this situation is (494 - 686) / 96 = -2. Recall that 95% of observations will fall within 2 standard deviations of mean. This means that 2.5% of observations will fall above 2 standard deviations and 2.5% of observations will fall below 2 standard deviations. This question asks for the percent of students who scored less than 494 (below 2 standard deviations). The correct answer is 2.5%.

2.5%

Which Excel function adds all of its arguments then divides the sum by the number of arguments?

AVERAGE

Which Excel function would be used to find the middle value of a list of values?

MEDIAN

Extreme observations that have values that are unusually large or unusually small are called

Outliers

Which of the following is NOT a measure of variability?

Skewness

To ___________ a table means to arrange all of the data in a specific order.

Sort

A Forbes subscriber survey asked 52 questions about subscriber characteristics and interests. One of the questions was, "Are you male or female?" The data resulting from this question is categorical.

True

In a survey of patients in a local hospital, 62.42% of the respondents indicated that the health care providers needed to spend more time with each patient. In this survey, the sample is all survey respondents.

True

The following question was asked of 500 people who were shopping at a local mall on the weekend: "How many different business publications do you read in an average week?" What type of study was conducted?

observational study

Which of the following would be expected to display a positive relationship?

the amount of time a student spends studying and their grade on an exam

The Quick Analysis button is a feature available in Excel that gives you

shortcuts for Conditional Formatting, adding Data Bars, and other operations.

A survey was conducted including a random sample of 50 companies that covered 10 different industries. The survey asked about how long the company has been in business, the company's annual revenue from the previous fiscal year, the industry, and annual profit margin from the previous fiscal year.How many variables were measured?

4

What is(are) the Mode(s) for this set of data points? 35 42 65 42 22

42

A survey was conducted including a random sample of 50 companies that covered 10 different industries. The survey asked about how long the company has been in business, the company's annual revenue from the previous fiscal year, the industry, and annual profit margin from the previous fiscal year. How many observations were included in this study?

50

According to the Empirical Rule, for data having a bell-shaped distribution approximately what percent of the data falls within 2 standard deviations of the mean?

95%

A Forbes subscriber survey asked 52 questions about subscriber characteristics and interests. The following question was one of the 52 questions asked "Did you start reading Forbes before, during, or after your first job?" What kind of data does this question provide?

Categorical

What is one benefit of using conditional formatting in Excel?

Conditional formatting can make it easy to identify data that satisfy certain conditions in a data set.

A Forbes subscriber survey asked 52 questions about subscriber characteristics and interests. The following question provides categorical data: "What is your age?"

False

In a survey of patients in a local hospital, 62.42% of the respondents indicated that the health care providers needed to spend more time with each patient. In this survey, the population being studied is health care providers.

False

A Forbes subscriber survey asked 52 questions about subscriber characteristics and interests. What type of data is provided by the following question: "How long have you been in your present job or position?"

Quantitative

Which of the following numerical summary measures cannot be negative?

Standard deviation

Data was collected on a particular stock every month for a period of 12 months. This is an example of

Time series data

Does talking on cell phones while driving affect reaction time? Researchers measured the reaction times of 162 study participants as they talked on cell phones and found that the average level of distraction from their driving was rated 2.2 out of 5, while those not talking on cell phones rated an average level of distraction from their driving at 3.9 out of 5. The population being studied in this case is all drivers.

True

The total of relative frequencies for a data set is always 1.

True

The difference in a variable measured over observations is referred to as

variation