STATISTICAL TECHNIQUES-ACCESS ONLY
16th Edition
ISBN: 9780077639648
Author: Lind
Publisher: MCG
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Chapter 16, Problem 1.8PT
To determine
State the major difference between Kruskal–Wallis test and Wilcoxon rank-sum test.
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Is the proportion of wildfires caused by humans in the south lower than the proportion of wildfires caused by humans in the west? 360 of the 501 randomly selected wildfires looked at in the south were caused by humans while 435 of the 588 randomly selected wildfires looked at the west were caused by humans. What can be concluded at the = 0.10 level of significance?
For this study, we should use Select an answer t-test for the difference between two dependent population means z-test for the difference between two population proportions t-test for a population mean t-test for the difference between two independent population means z-test for a population proportion
The null and alternative hypotheses would be:
Select an answer μ1 p1 Select an answer < ≠ > = Select an answer μ2 p2 (please enter a decimal)
Select an answer μ1 p1 Select an answer > ≠ < = Select an answer p2 μ2 (Please enter a decimal)
The test statistic ? z t = (please show your…
The correlation coefficient r is a sample statistic. What does it tell us about the value of the population correlation coefficient ρ (Greek letter rho)? You do not know how to build the formal structure of hypothesis tests of ρ yet. However, there is a quick way to determine if the sample evidence based on ρ is strong enough to conclude that there is some population correlation between the variables. In other words, we can use the value of r to determine if ρ ≠ 0. We do this by comparing the value |r| to an entry in the correlation table. The value of α in the table gives us the probability of concluding that ρ ≠ 0 when, in fact, ρ = 0 and there is no population correlation. We have two choices for α: α = 0.05 or α = 0.01.
(a) Look at the data below regarding the variables x = age of a Shetland pony and y = weight of that pony. Is the value of |r| large enough to conclude that weight and age of Shetland ponies are correlated? Use α = 0.05. (Use 3 decimal places.)
x
3
6
12
22
26…
Three students, an athlete, a fraternity member, and an honors student, record the number of hours they slept each night for 20 nights.
O JMP Applet
imp
?
Oneway Analysis of Sleep Hours By Student
Oneway Analysis of Sleep Hours By Student
10
Oneway Anova
14
Summary of Fit
12
Rsquare
0.024506
10-
Adj Rsquare
Root Mean Square Error
Mean of Response
Observations (or Sum Wgts)
-0.00072
1.99517
7.7
60
Analysis of Variance
Sum of
Mean
F
Prob >
Source
DF
Squares
Square
Ratio
F
2
Athiete
Frat
Honors
Student
2
5.70000
2.85000 0.7180 0.4931
Student
Error
57
226.90000
3.98070
C. Total
59
232.60000
Oneway Anova
Means for Oneway Anova
Std Lower
Upper
95%
Summary of Fit
Level
Number
Mean
Error
95%
Athlete
20 8.10000 0.44813 7.2086 8.9934
Rsquare
0.024506
Frat
20 7.65000 0.44813 6.7588 8.5434
Adj Rsquare
Root Mean Square Error
Mean of Response
Observations (or Sum Wgts)
-0.00972
Honors
20 7.35000 0.44813 6.4586 8.2434
1.99517
Std Error uses a pooled estimate of error variance
7.7
60
Analysis of…
Chapter 16 Solutions
STATISTICAL TECHNIQUES-ACCESS ONLY
Ch. 16 - Prob. 1SRCh. 16 - Prob. 1ECh. 16 - Prob. 2ECh. 16 - Calorie Watchers has low-calorie breakfasts,...Ch. 16 - Prob. 4ECh. 16 - Prob. 2SRCh. 16 - Prob. 5ECh. 16 - Prob. 6ECh. 16 - Prob. 7ECh. 16 - Prob. 8E
Ch. 16 - Prob. 3SRCh. 16 - Prob. 9ECh. 16 - Prob. 10ECh. 16 - Prob. 4SRCh. 16 - Prob. 11ECh. 16 - Prob. 12ECh. 16 - Prob. 13ECh. 16 - Prob. 14ECh. 16 - Prob. 5SRCh. 16 - Prob. 15ECh. 16 - Prob. 16ECh. 16 - Prob. 17ECh. 16 - Prob. 18ECh. 16 - Prob. 6SRCh. 16 - Prob. 19ECh. 16 - Prob. 20ECh. 16 - Prob. 21ECh. 16 - Prob. 22ECh. 16 - Prob. 23ECh. 16 - Prob. 24ECh. 16 - Prob. 7SRCh. 16 - Prob. 25ECh. 16 - Prob. 26ECh. 16 - Prob. 27ECh. 16 - Prob. 28ECh. 16 - Prob. 29CECh. 16 - Prob. 30CECh. 16 - Prob. 31CECh. 16 - Prob. 32CECh. 16 - Prob. 33CECh. 16 - Prob. 34CECh. 16 - Prob. 35CECh. 16 - Prob. 36CECh. 16 - Prob. 37CECh. 16 - Prob. 38CECh. 16 - Prob. 39CECh. 16 - Professor Bert Forman believes the students who...Ch. 16 - Prob. 41DECh. 16 - Refer to the Baseball 2012 data, which report...Ch. 16 - Prob. 43DECh. 16 - Prob. 1PCh. 16 - The manufacturer of childrens raincoats wants to...Ch. 16 - Prob. 3PCh. 16 - Prob. 4PCh. 16 - B. Thomas Testing Labs John Thomas, the owner of...Ch. 16 - Prob. 1.1PTCh. 16 - Prob. 1.2PTCh. 16 - Prob. 1.3PTCh. 16 - Prob. 1.4PTCh. 16 - Prob. 1.5PTCh. 16 - Prob. 1.6PTCh. 16 - Prob. 1.7PTCh. 16 - Prob. 1.8PTCh. 16 - Prob. 1.9PTCh. 16 - Prob. 1.10PTCh. 16 - Prob. 2.1PTCh. 16 - Prob. 2.2PTCh. 16 - Prob. 2.3PTCh. 16 - Prob. 2.4PT
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- What is an experiment?arrow_forwardA researcher is interested in studying the average number of traffic violations received by male vs. female drivers. The researcher has a sample of 30 male drivers and 32 female drivers and conducts a two-sample t-test (two-tailed, alpha = .05). The researcher finds the following: 1. Male drivers have an average of 4 traffic violations every year. 2. Female drivers have an average of 2 traffic violations every year. 3. The standard error of the mean difference between male and female drivers (i.e., the se) is .50. What are the degrees of freedom for this test? Enter your answer as a whole number with no decimal places (i.e., 10, not 10.01, not 10.0, not 10.1).arrow_forwardAn airport official wants to prove that the proportion of delayed flights for Airline A (denoted as p1) is less than the proportion of delayed flights for Airline B (denoted as p2). Random samples for both airlines after a storm showed that 51 out of 200 flights for Airline A were delayed, while 60 out of 200 of Airline B's flights were delayed. The test statistic for this problem is -1.00. The p-value for the test statistic for this problem is: p = 0.0228 p = 0.0668 p = 0.3413 p = 0.1587arrow_forward
- You collect data on coronavirus cases from a random sample of cities of similar sizes in cold climates and in warm climates and make the following table: (This data can be copied into Excel.) You use this data to answer the research question: is the population average number of coronavirus cases different in warm cities and cold cities? You assume that the variances of coronavirus cases are not equal across cold cities and warm cities. What is the p-value associated with your hypothesis test? Round your answer to four decimal places.arrow_forward2. What is the difference between a t test for independent samples and a t test for dependent samples? 3. When doing a t test for dependent samples, when would you accept the null hypothesis?arrow_forwardh) ii). Consider the results in Table 5. After running the regression, we test whether the coefficients of the variables hhsize1 and hhsize2 are equal at 5% significance level. The value of the F-statistic is 26.32. Note that the sample size is 1,593. What is the outcome of the test? i). Do you think the regression in Table 5 suffers from omitted variable bias? If yes, which additional variables would you include to control for omitted variable bias?arrow_forward
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