DA CH. 2 Review Questions

Scores on Ms. Bond's test have a mean of 70 and a standard deviation of 11. Michelle has a score of 48. Convert Michelle's score to a z-score. (Round to two decimal places if necessary.) a. 2 b. 41.64 c. -2 d. 1.33

-2

Compute the relative frequency for students who earned an A shown in the table of grades below a. 0.12 b. 0.10 c. 0.83 d. Not enough information

0.12

Below is a histogram for the number of days that it took Wyche Accounting to perform audits in the last quarter of last year. What is the relative frequency of the 21-24 bin? a. 0.05 b. 0.14 c. 0.25 d. 2.5

0.25

What is the total relative frequency? a. 1 b. 99.12 c. 0.88 d. Not enough information

1

Compute the geometric mean for the following data on growth factors of an investment for 10 years. 1.10, 0.50, 0.70, 1.21, 1.25, 1.12, 1.16, 1.11, 1.13, 1.22 a. 1.0221 b. 1.0148 c. 1.0363 d. 1.1475

1.0148

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 scores follow a bell-shaped distribution, use the empirical rule to find the percentage of students who scored less than 400. a. 16% b. 68% c. 84% d. 32%

16%

Compute the third quartile for the following data. 10, 15, 17, 21, 25, 12, 16, 11, 13, 22 a. 21.25 b. 15.5 c. 21.5 d. 11.75

21.25

Compute the coefficient of variation for the following sample data. 32, 41, 36, 24, 29, 30, 40, 22, 25, 37 a. 18.64% b. 21.36% c. 20.28% d. 21.67%

21.36%

Consider a sample on the waiting times (in minutes) at the billing counter in a grocery store to be 15, 24, 18, 15, 21, 20, 15, 22, 19, 16, 15, 22, 20, 15, and 21. Compute the 25th , 50th , and 75th percentiles

25th percentile = 15 50th percentile = 19 75th percentile = 21

Compute the median of the following data. 32, 41, 36, 24, 29, 30, 40, 22, 25, 37 a. 28 b. 31 c. 40 d. 34

31

Consider the data below. What percentage of students scored grade C? | students A | 16 B | 28 C | 33 D | 13 Total | 90 a. 33% b. 31% c. 37% d. 28%

37%

Below is the data for the number of days that it took Wyche Accounting to perform audits in the last quarter of last year. 56, 42, 37, 29, 45, 51, 30, 25, 34, 57 What is the median number of days that it took Wyche Accounting to perform audits in the last quarter of last year? a. 41 b. 40.6 c. 39.5 d. 42

39.5

A sample of 13 adult males' heights are listed below. 70, 72, 71, 70, 69, 73, 69, 68, 70, 71, 67, 71, 74 Find the range of the data. a. 7 b. 6.5 c. 5 d. 4

7

A manager of a fast food restaurant wants the drive-thru employee to ask every fifth customer if he or she is satisfied with the service. Who makes up the population? a. All customers who use the drive-thru window of this fast food restaurant b. All survey respondents c. All customers of this restaurant d. The proportion of customers who say they are satisfied with their service

All customers who use the drive-thru window of this fast food restaurant

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. Who makes up the population? a. All patients in a local hospital b. All survey respondents c. Hospital patients d. Cannot be determined from the information given

All patients in a local hospital

Select the histogram that is moderately skewed right. a. A b. B c. C d. D

B.

Scores on Ms. Bond's test have a mean of 70 and a standard deviation of 11. David has a score of 52 on Ms. Bond's test. Scores on Ms. Nash's test have a mean of 64 and a standard deviation of 6. Steven has a score of 52 on Ms. Nash's test. Which student has the higher standardized score? a. David's standardized score is -1.64 and Steven's standardized score is -2.00. Therefore, David has the higher standardized score. b. David's standardized score is -1.64 and Steven's standardized score is -2.00. Therefore, Steven has the higher standardized score. c. David's standardized score is 1.64 and Steven's standardized score is 2.00. Therefore, Steven has the higher standardized score. d. Cannot be determined with the information provided.

David's standardized score is -1.64 and Steven's standardized score is -2.00. Therefore, Steven has the higher standardized score.

Consider a sample on the waiting times (in minutes) at the billing counter in a grocery store to be 15, 24, 18, 15, 21, 20, 15, 22, 19, 16, 15, 22, 20, 15, and 21. Compute the mean, median, and mode.

Mean = 18.53 Median = 19 Mode = 15

The amount of time taken by each of 10 students in a class to complete an exam is an example of what type of data? a. Cannot be determined b. Categorical data c. Time series data d. Quantitative data

Quantitative data

Which of the following gives the proportion of items in each bin? a. Frequency b. Class size c. Relative frequency d. Bin proportion

Relative frequency

Identify the shape of the distribution in the figure below a. Skewed left b. Symmetric c. Approximately bell shaped d. Skewed right

Skewed right

You have been asked to reorganize the Excel table below into order of sales using the Sales column. Which option will allow you to do this quickly? a. Use the Cut and Paste function to reorganize the data into order of sales. b. Use the Filter function to organize the data into order of sales. c. Use the Order function to organize the data into order of sales. d. Use the Sort function to organize the data into order of sales.

Use the Sort function to organize the data into order of sales.

A student willing to participate in a debate competition is required to fill out a registration form. State whether each of the following information about the participant provides categorical or quantitative data. a. What is your birth month? b. Have you participated in any debate competition previously? c. If yes, in how many debate competitions have you participated so far? d. Have you won any of the competitions? e. If yes, how many have you won?

a. Categorical b. Categorical c. Quantitative d. Categorical e. Quantitative

When working with data sets in Excel, _____ can be used to automatically highlight cells that meet specified requirements. a. averaging b. conditional formatting c. summing d. sorting

conditional formatting

The variance is based on the a. deviation about the median. b. number of variables. c. deviation about the mean. d. correlation in the data.

deviation about the mean.

You would __________ a table if you wanted to display only data that match specific criteria.

filter

Data sets commonly include observations with missing values for one or more variables. In some cases missing data naturally occur; these are called _____. a. legitimately missing data b. data cleansing c. illegitimate missing data d. missing random data

legitimately missing data

Below are the data for the number of days that it took Wyche Accounting to perform audits in the last quarter of last year. 56, 42, 37, 29, 45, 51, 30, 25, 34, 57 What is(are) the mode(s) number of days that it took Wyche Accounting to perform audits in the last quarter of last year?

none

The data collected from the customers in restaurants about the quality of food is an example of a(n) _____. a. variable study b. cross-sectional study c. experimental study d. observational study

observational study

Any data value with a z-score less than -3 or greater than +3 is considered to be a(n) _____. a. outlier b. statistic c. whisker d. z-score value

outlier

The act of collecting data that are representative of the population data is called _____. a. random sampling b. sample data c. population sampling d. sources of data

random sampling

The difference between the largest and the smallest data values is the __________.

range

The _____ is a point estimate of the population mean for the variable of interest. a. sample mean b. median c. sample d. geometric mean

sample mean

Which of the following relationships would have a negative correlation coefficient? a. Supply and demand b. Amount of a bill at a restaurant and the amount of the tip c. Cost of a car and the amount of tax to be paid d. The square footage of a home and the price of the home

supply and demand

If the covariance between two variables is near 0, it implies that ______. a. a positive relationship exists between the variables b. the variables are not linearly related c. the variables are negatively related d. the variables are strongly related

the variables are not linearly related

Data collected from several entities over a period of time (minutes, hours, days, etc.) are called _____. a. categorical and quantitative data b. time series data c. source data d. cross-sectional data

time series data

A quantity of interest that can take on different values is known as a(n) _____. a. variable b. parameter c. sample d. observation

variable

The difference in a variable measured over observations (time, customers, items, etc.) is known as _____. a. observed differences b. variation c. variable change d. descriptive analytics

variation

The goal regarding using an appropriate number of bins is to show the _____. a. number of observations b. number of variables c. variation in the data d. correlation in the data

variation in the data

A _____ determines how far a particular value is from the mean relative to the data set's standard deviation. a. coefficient of variation b. z-score c. variance d. percentile

z-score