Introduction To Statistics And Data Analysis
6th Edition
ISBN: 9781337793612
Author: PECK, Roxy.
Publisher: Cengage Learning,
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Chapter 12.1, Problem 5E
A popular urban legend is that more babies than usual are born during certain phases of the lunar cycle, especially near the full moon. The paper “The Effect of the Gravitation of the Moon on Frequency of Births” (Environmental Health Insights [2010]: 65–69) classified a random sample of 1007 births at a large hospital in Japan according to lunar phase. In each lunar cycle (27.32 days), the moon moves 360° relative to the earth. To determine lunar phase, the researchers divided the 360° in one lunar cycle into 12 phases of 30°. The sample data are summarized in the accompanying frequency table.
The researchers concluded that the frequency of births is not related to lunar cycle. Carry out a chi-square goodness-of-fit test to determine if the data are consistent with the researchers’ claim. Use a significance level of 0.05 for your test.
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Worksheet 10
Jesse runs a small business selling and delivering mealie meal to the spaza shops.
He charges a fixed rate of R80, 00 for delivery and then R15, 50 for each packet of
mealle meal he delivers. The table below helps him to calculate what to charge
his customers.
10
20
30
40
50
Packets of mealie
meal (m)
Total costs in Rands
80
235
390
545
700
855
(c)
10.1.
Define the following terms:
10.1.1. Independent Variables
10.1.2. Dependent Variables
10.2.
10.3.
10.4.
10.5.
Determine the independent and dependent variables.
Are the variables in this scenario discrete or continuous values? Explain
What shape do you expect the graph to be? Why?
Draw a graph on the graph provided to represent the information in the
table above.
TOTAL COST OF PACKETS OF MEALIE MEAL
900
800
700
600
COST (R)
500
400
300
200
100
0
10
20
30
40
60
NUMBER OF PACKETS OF MEALIE MEAL
Let X be a random variable with support SX = {−3, 0.5, 3, −2.5, 3.5}. Part ofits probability mass function (PMF) is given bypX(−3) = 0.15, pX(−2.5) = 0.3, pX(3) = 0.2, pX(3.5) = 0.15.(a) Find pX(0.5).(b) Find the cumulative distribution function (CDF), FX(x), of X.1(c) Sketch the graph of FX(x).
Chapter 12 Solutions
Introduction To Statistics And Data Analysis
Ch. 12.1 - A particular cell phone case is available in a...Ch. 12.1 - From the given information in each case below, use...Ch. 12.1 - In 2014, the University of Houston carried out a...Ch. 12.1 - The Global Automotive 2016 Color Popularity Report...Ch. 12.1 - A popular urban legend is that more babies than...Ch. 12.1 - The authors of the paper External Factors and the...Ch. 12.1 - The authors of the paper Is It Really About Me?...Ch. 12.1 - The article In Bronx, Hitting Home Runs Is A...Ch. 12.1 - The authors of the paper Racial Stereotypes in...Ch. 12.1 - The paper Sociochemosensory and Emotional...
Ch. 12.1 - How would you answer the following question: Next...Ch. 12.1 - USA Today (Hybrid Car Sales Rose 81% Last Year,...Ch. 12.1 - A certain genetic characteristic of a particular...Ch. 12.2 - A particular state university system has six...Ch. 12.2 - A random sample of 1000 registered voters in a...Ch. 12.2 - Prob. 16ECh. 12.2 - Some colleges now allow students to pay their...Ch. 12.2 - The Knight Foundation asked each person in a...Ch. 12.2 - The Knight Foundation investigated whether high...Ch. 12.2 - Each person in a representative sample of 445...Ch. 12.2 - The report Education Pays 2016 (The College...Ch. 12.2 - The report Consumer Revolving Credit and Debt Over...Ch. 12.2 - Prob. 23ECh. 12.2 - The authors of the paper Movie Character Smoking...Ch. 12.2 - The data summarized in the accompanying table are...Ch. 12.2 - The paper Credit Card Misuse, Money Attitudes, and...Ch. 12.2 - Each person in a large sample of German...Ch. 12.2 - Can people tell the difference between a female...Ch. 12.3 - The following passage is from the paper Gender...Ch. 12.3 - The article titled Nap Time...Ch. 12.3 - Using data from a national survey, the authors of...Ch. 12 - Each observation in a random sample of 100 bicycle...Ch. 12 - The color vision of birds plays a role in their...Ch. 12 - Prob. 34CRCh. 12 - Prob. 35CRCh. 12 - Prob. 36CR
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