Question

round all answers to 1 decimal place where applicable

This is your summative test covering Data Management. You will have up to two (2) hours to complete the test once you have begun and may not have more than one attempt. Round all answers to 1 decimal place where applicable. 1. Identify the source(s) of bias in the following scenarios/questions (there may be more than one source of bias in some of the scenarios/questions below). Give reasons for your choice(s). Where applicable, re-write the question to remove the bias. a. A survey asks every other shopper at a local grocery store if they would prefer to buy groceries online. Less than half agree to complete the questionnaire. b. Why does chocolate A taste better than chocolate B? 2. Data collected on a person's monthly expenses on eating in restaurants and monthly net income are collected and shown below. Monthly net income Monthly net income Eating in restaurants ($) Eating in restaurants (S) (S) ($) 50 1200 1400 60 70 20 1050 1500 100 1500 40 1200 80 1100 55 1300 75 1350 35 1450 55 65 1450 1200 90 1150 1400 30 30 1150 20 1100 25 1100 1550 90 a. Identify each variable as discrete or continuous b. Pose a question that would require single-variable analysis, then summarize the results graphically.

Answer 1

a) The local grocery store may be frequented by a certain class of people depending on the location and relative prices at the shop. The question should be asked to all shoppers at all grocery stores

b) Chocolate A need not be better than Chocolate B. Question should be "Do you think chocolate A is better than B"?

2) a) Both Income and Eating our are continuous variables

b) Does Eating out depend on Income?

Scatter plot of data and regression line are given below:

1450 65 1600 30 1150 20 1100 90 1550 1400 У~ ах, + b STATISTICS RESIDUALS 2=0.4951 1200- e. plot r0.7037 PARAMETERS a 4.54955 b1035.89 +000 powered by desmos 120 80 140 20 60 Ао 100

Based on the R-square value of 49.51% we can say that Income is a moderately good indicator of Amount spent eating out

The equation is

Eating out 4.55 x Income 1035.9