Q: The coefficient of variation is calculated as $$\frac{s}{\bar{x}} \times 100\%. If $$GLD ETF has $$s = 25.74$$ and $$\bar{x} = 104.75$$, what is the coefficient of variation?

$$\frac{25.74}{104.75} \times 100\% = 24.57\%$$

Question 1

Which of the following best describes a time series data set?

Accepted Answer

A set of data values measured for a subject over multiple time periods.

Question 2

Which mathematical operation is appropriate for nominal data?

Accepted Answer

Counting frequencies

Question 3

A scatterplot is most useful for:

Accepted Answer

Identifying the relationship between two quantitative variables.

Question 4

Which of the following is true about outliers in a data set?

Accepted Answer

Outliers are values that are unusually far from most other values.

Question 5

The standard deviation is defined as:

Accepted Answer

The positive square root of the variance.

Question 6

Which of the following pairs correctly represents a population and a sample from that population?

Accepted Answer

Residents of Albany, New York, and registered voters in Albany, New York

Question 7

An analyst collects weekly closing prices of gold throughout a year. What is the scale of measurement?

Accepted Answer

Ratio scale

Question 8

Given the scores: 1, 4, 4, 5, 5, 3, 4, 3, 4, 1, 5, 5, 4, 4, 2, 3, 3, 2, 3, 3, 4, 5, 5, 5, 5, 3, 2, 3, 3, 2. What percentage of students gave Professor Smith an evaluation higher than 3?

Accepted Answer

50%

Question 9

If a scatterplot shows points sloping downward from left to right, what type of relationship is indicated?

Accepted Answer

A negative linear relationship

Question 10

Given the frequency distribution: –10 \u003c x \u003c 0: 8; 0 \u003c x \u003c 10: 25; 10 \u003c x \u003c 20: 15; 20 \u003c x \u003c 30: 2. How many stocks had returns greater than 10%?

Accepted Answer

17

Question 11

The annual returns (in percent) for a sample of stocks are: 4.2, –9.4, 2.8, –16.0, –6.6. What is the sample standard deviation closest to?

Accepted Answer

8.49

Question 12

The mode of a data set is:

Accepted Answer

The most frequent value in a data set.

Question 13

In the Cape May County property sales data, which two variables are measured on the ratio scale?

Accepted Answer

Price ($$) and Assessment ()$$

Question 14

In the Cape May County property sales data, is 'Type' a qualitative or quantitative variable?

Accepted Answer

Qualitative, because it describes a category.

Question 15

Given the GLD ETF yearly prices: 83, 87, 110, 139, and the mean $$\bar{X} = 104.75. $$The sum of squared deviations is $$1988.75. $$What is the sample variance?

Accepted Answer

$$\frac{1988.75}{3}$$

Question 16

For the SLV ETF, the yearly prices are 15, 11, 17, 30, with mean $$\bar{Y} = 18.25$$ and sum of squared deviations $$202.75. $$What is the sample standard deviation?

Accepted Answer

$$\sqrt{\frac{202.75}{3}}$$

Question 17

Which asset had a greater variance: GLD ETF or SLV ETF?

Accepted Answer

GLD ETF

Question 18

The coefficient of variation is calculated as $$\frac{s}{\bar{x}} 	imes 100\%. If $$GLD ETF has $$s = 25.74$$ and $$\bar{x} = 104.75$$, what is the coefficient of variation?

Accepted Answer

$$\frac{25.74}{104.75} 	imes 100\% = 24.57\%$$

Question 19

A bowler's scores for seven games are: 172, 168, 188, 190, 172, 182, 174. What is the median score?

Accepted Answer

174

Step-by-Step Guidance for MAT 117 Sample Exam 1 (Introductory Statistics)

Study Guide - Practice Questions

Study Guide - Flashcards