Question 1

Which of the following best describes the primary objective of statistical thinking in business decision-making, as emphasized in this course?

Accepted Answer

To use data analysis to inform and justify managerial decisions by understanding variation and modeling uncertainty.

Question 2

A business analyst is comparing the monthly sales of two products to determine if there is a significant difference. Which statistical concept is MOST relevant for this analysis?

Accepted Answer

Inferential statistics, specifically hypothesis testing

Question 3

Suppose you are given a dataset with missing values and outliers. What is the FIRST step you should take before performing any statistical analysis?

Accepted Answer

Clean and organize the data, addressing missing values and outliers.

Question 4

A manager wants to know if a new training program has improved employee productivity. Which of the following is the most appropriate statistical method to use?

Accepted Answer

A paired sample t-test comparing productivity before and after the program

Question 5

Which formula correctly calculates the sample variance $$s^2$$ for a dataset with $$n$$ observations $$x_1$$, $$x_2$$, ..., x_n$$ and sample mean $$\bar{x}$$?

Accepted Answer

$$s^2$$ = \frac{1}{n-1} \sum_{i=1}^n (x_i - \bar{x}$$)^2$$

Question 6

A company wants to predict future sales based on advertising expenditure. Which statistical model is most appropriate for this task?

Accepted Answer

Simple linear regression

Question 7

If a dataset is highly skewed to the right, which measure of central tendency is most likely to be greater than the others?

Accepted Answer

Mean

Question 8

A business wants to test if the average time to resolve a customer complaint is less than 48 hours. Which is the correct null hypothesis $$H_0$$ for this scenario?

Accepted Answer

$$H_0$$: \mu = 48$$

Question 9

Which of the following best describes the purpose of using JMP Pro software in this course?

Accepted Answer

To facilitate data analysis and visualization, supporting statistical modeling and decision-making

Question 10

A project team collects data on customer satisfaction scores (1-10) from 200 customers. They want to summarize the data and identify any unusual responses. Which two statistical tools should they use FIRST?

Accepted Answer

Histogram and boxplot

Question 11

A company is interested in the relationship between employee experience (in years) and salary. Which statistical measure would best quantify the strength and direction of this relationship?

Accepted Answer

Correlation coefficient $$r$$

Question 12

Which of the following is an example of a categorical variable in a business context?

Accepted Answer

Employee job title

Question 13

A business analyst uses a sample mean $$\bar{x} to $$estimate the population mean $$\mu. $$What is this process called?

Accepted Answer

Inferential statistics

Question 14

Which of the following statements about statistical models is TRUE?

Accepted Answer

Statistical models help quantify uncertainty and guide decision-making.

Question 15

A company wants to compare the mean productivity of three different departments. Which statistical test should they use?

Accepted Answer

One-way ANOVA

Question 16

If the probability of a customer making a purchase is 0.2, what is the probability that out of 5 customers, exactly 2 will make a purchase? (Assume independence.)

Accepted Answer

$$P = \binom{5}{2} (0.2)^2$ (0.8)^3$ = 0.2048$$

Question 17

A business collects data on the number of defective products per day. Which probability distribution is most appropriate for modeling this data?

Accepted Answer

Poisson distribution

Question 18

Which of the following best explains why it is important to distinguish between population and sample in business statistics?

Accepted Answer

Because conclusions about the population are drawn from sample data, and different formulas are used for sample and population statistics.

Question 19

A company wants to estimate the proportion of customers who prefer a new product. They survey 200 customers and find that 60 prefer the new product. What is the sample proportion $$\hat{p}$$?

Accepted Answer

$$\hat{p} = \frac{60}{200} = 0.30$$

Statistics for Business: Course Syllabus and Overview

Guida di studio - Domande di pratica

Study guide - Flashcard