quiz 1 - btm 400

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Seneca College *

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400

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Statistics

Date

Feb 20, 2024

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docx

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Uploaded by MajorFrog4021

 Question 1 1 out of 1 points In a(n) _____, one or more variables are identified and controlled or manipulated so that data can be obtained about how they influence the variable of interest identified first. Selected Answer: b. experimental study Answers: a. variable study b. experimental study c. categorical study d. observational study Response Feedback: Rationale: In an experimental study, a variable of interest is first identified. Then one or more other variables are identified and controlled or manipulated so that data can be obtained about how they influence the variable of interest.  Question 2 0 out of 1 points The act of collecting data that are representative of the population data is called Selected Answer: b. sample data. Answers: a. population sampling. b. sample data. c. applications of business analytics. d. random sampling. Response Feedback: Rationale: A representative sample can be gathered by random sampling of the population data.  Question 3 1 out of 1 points The data on the time taken by 10 students in a class to answer a test is an example of Selected Answer: c. quantitative data. Answers: a. time series data.

b. population data. c. quantitative data. d. categorical data. Response Feedback: Rationale: Data are considered quantitative data if numeric and arithmetic operations, such as addition, subtraction, multiplication, and division, can be performed on them.  Question 4 0 out of 1 points For data having a bell-shaped distribution, approximately _____ percent of the data values will be within one standard deviation of the mean. Selected Answer: c. 95 Answers: a. 97 b. 68 c. 95 d. 66 Response Feedback: Rationale: Approximately 68 percent of the data values will be within one standard deviation of the mean for data having a bell-shaped distribution.  Question 5 0 out of 1 points A set of values corresponding to a set of variables is defined as a(n) _____. Selected Answer: b. event Answers: a. factor b. event c. observation d. quantity

Response Feedback: Rationale: An observation is a set of values corresponding to a set of variables.  Question 6 1 out of 1 points _____ provide facts and figures that can be used for analysis and interpretation of a population of interest. Selected Answer: b. Data Answers: a. Variables b. Data c. Query d. Range Response Feedback: Rationale: Data are the facts and figures collected, analyzed, and summarized for presentation and interpretation.  Question 7 1 out of 1 points _____ act(s) as a representative of the population. Selected Answer: a. A sample Answers: a. A sample b. The random variables c. The variance d. The analytics Response Feedback: Rationale: A subset of the population is known as a sample, and it acts as a representative of the population.  Question 8 1 out of 1 points The difference in a variable measured over observations (time, customers, items, etc.) is called as _____. Selected Answer: b. variation

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Answers: a. observed differences b. variation c. variable change d. descriptive analytics Response Feedback: Rationale: Variation is the difference in a variable measured over observations (time, customers, items, etc.).  Question 9 1 out of 1 points A summary of data that shows the number of observations in each of several nonoverlapping bins is called Selected Answer: c. a frequency distribution. Answers: a. a bin distribution. b. an observed distribution. c. a frequency distribution. d. a sample summary. Response Feedback: Rationale: A frequency distribution is a summary of data that shows the number (frequency) of observations in each of several nonoverlapping classes, typically referred to as bins, when dealing with distributions.  Question 10 0 out of 1 points Identify the shape of the distribution in the below figure. Selected Answer: c. Moderately skewed left Answers: a. Highly skewed right b. Symmetric

c. Moderately skewed left d. Moderately skewed right Response Feedback: Rationale: A histogram is said to be skewed to the right if its tail extends farther to the right than to the left. The given histogram is, therefore, moderately skewed to the right.  Question 11 0 out of 1 points _____ are collected from several entities at the same point in time. Selected Answer: a. Categorical and quantitative data Answers: a. Categorical and quantitative data b. Random data c. Time series data d. Cross-sectional data Response Feedback: Rationale: Cross-sectional data are collected from several entities at the same, or approximately the same, point in time.  Question 12 1 out of 1 points The _____ shows the number of data items with values less than or equal to the upper class limit of each class. Selected Answer: c. cumulative frequency distribution Answers: a. percent frequency distribution b. frequency distribution c. cumulative frequency distribution d. relative frequency distribution Response Feedback: Rationale: The cumulative frequency distribution shows the number of data items with values less than or equal to the upper class limit of each class.

 Question 13 0 out of 1 points A _____ determines how far a particular value is from the mean relative to the data set’s standard deviation. Selected Answer: c. percentile Answers: a. coefficient of variation b. variance c. percentile d. z -score Response Feedback: Rationale: A z -score helps us determine how far a particular value is from the mean relative to the data set’s standard deviation.  Question 14 1 out of 1 points The data on grades (A, B, C, and D) scored by all students in a test is an example of Selected Answer: c. categorical data. Answers: a. sample data. b. quantitative data. c. categorical data. d. analytical data. Response Feedback: Rationale: If arithmetic operations cannot be performed on the data, they are considered categorical data.  Question 15 1 out of 1 points _____ is a graphical summary of data previously summarized in a frequency distribution. Selected Answer: a. Histogram Answers: a. Histogram

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b. Scatter chart c. Box plot d. Line chart Response Feedback: Rationale: A common graphical presentation of quantitative data is a histogram. This graphical summary can be prepared for data previously summarized in either a frequency, a relative frequency, or a percent frequency distribution.  Question 16 6 out of 6 points The manager of an automobile showroom studied the time (in mn) spent by each salesman interacting with the customer in a month apart from the other jobs assigned to them. Given the following frequency table, answer each of the following questions: Class Frequency Relative Frequency Cumulative Frequency Cumulative Relative Frequency 10-13 4 0.17 4 0.17 14-17 7 0.29 11 0.46 18-21 6 0.25 17 0.71 22-25 4 0.17 21 0.88 26-29 3 0.13 24 1.00 (approx.) Total 24 ≈1 The proportion of salesmen who spend between 22 and 25 hours of time is ____. The proportion of salesmen who spend over 21 hours of time with the customers is ____. The proportion of salesmen who spend over 25 hours of time with the customers is ____.

Selected Answer: The proportion of salesmen who spend between 22 and 25 hours of time is 17% The proportion of salesmen who spend over 21 hours of time with the customers is 30% The proportion of salesmen who spend over 25 hours of time with the customers is 13% Correct Answer: [None] Response Feedback: [None Given]  Question 17 0 out of 5 points A study on the average minutes spent by students on internet usage is 300 with a standard deviation of 102. Assuming a bell-shaped distribution and using the empirical rule, draw conclusions about the percentage of students and the time spent on internet usage. Selected Answer: Since the average time spent by student is approximate 300 minutes and By using the empirical rule to factor the SD of 102, there is a high percentage of student using the internet at a certain allotted time during the period of 24 hours. The bell shape also indicates the usage of internet is lowest in the mornings & nights when students are either waking up or going to sleep The bell shape also indicates that internet usage is at at its peak during the mid day when students are most active Correct Answer: [None] Response Feedback: * 68% of the students spend between 198 mn (300-1*SD) and 402mn (300+1*SD) on internet usage * 95% of students spend between 96 mn (300-2*SD) and 504 mn (300+2*SD) on internet usage  Question 18 3 out of 5 points Consider a sample on the waiting times (in minutes) by customers at the billing counter in a grocery store. The 50th percentile is equal 19min. Interpret this value in a sentence. Selected Answer: Less than half of customers will experience a wait time of 19 minutes. A majority of the customers will experience a wait time of 4.25 minutes which will be a lower percentile. There is a very little chance some customers might get to wait for than 25 minutes. We can assume that grocery store does not have enough manpower or their POS systems are faulty Correct Answer: [None] Response Feedback: 50% of the customers in the sample waited for 19 minutes or less at the billing counter in the grocery store.  Question 19 4 out of 4 points

A student willing to participate in a debate competition required to fill a registration form. State whether each of the following information about the participant provides categorical or quantitative data. o Question Correct Match Selected Match How old are you? b. Quantitative b. Quantitative Have you participated in any debate competition previously? a. Categorical a. Categorical how many debate competitions have you participated so far? b. Quantitative b. Quantitative Have you won any of the competitions? a. Categorical a. Categorical o All Answer Choices a. Categorical b. Quantitative o

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