C) A researcher has a theory that the season one is born in will affect their height.He samples 22 adult males and measures their height in inches, along with whatseason they were born in. Can he conclude that the population mean height ofmales is different depending on what season they were born in? Use a 5% level ofsignificance.SpringSummerWinterFall66686773666968746970717075687171717073200706968

To determine if the population mean height of males is different depending on the season they were…

Answered: C) A researcher has a theory that the…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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a) Determine the values of * and ** b) Give the unbiased point estimate for the average monthly earnings from Hyundai Vehicles. c) Give the unbiased point estimate for the variance of monthly earnings from Hyundai Vehicles.
The mean birthweight of an infant is thought to be associated with the smoking status of the mother during the first trimester of the pregnancy. Consider the following data from mothers divided into four categories according to smoking habits, and the corresponding birthweights of their children. Group 1: Mother is a non smoker (NON): 7.5, 6.2, 6.9, 7.4, 9.2, 8.3, 7.6 Group 2: Mother is an ex-smoker (EX): 5.8, 7.3, 8.2, 7.1, 7.8 Group 3: Mother is a current smoker, smokes less than 1 pack per day (CUR < 1) 5.9, 6.2, 5.8, 4.7, 8.3, 7.2, 6.2 Group 4: Mother is a current smoker, smokes more than or equal to 1 pack per day (Cur ≥ 1) 6.2, 6.8, 5.7, 4.9, 6.2, 7.1, 5.8, 5.4 Using Stata test whether or not the mean birthweights are equal across all four groups at the alpha = 0.05 level. What is the corresponding p-value? O 0.0284 0.0137 O 0.05 O 0.737
Using the data set below, what is the mean number of syphillis cases in Region 4 for the period 2008-2012? *
The data contains the trunk circumference and height (in inches) of 31 black cherry trees. Suppose you are interested in predicting the height of a tree from its trunk circumference. Circumference Height 8.3 70 8.6 65 8.8 63 10.5 72 10.7 81 10.8 83 11 66 11 75 11.1 80 11.2 75 11.3 79 11.4 76 11.4 76 11.7 69 12 75 12.9 74 12.9 85 13.3 86 13.7 71 13.8 64 14 78 14.2 80 14.5 74 16 72 16.3 77 17.3 81 17.5 82 17.9 80 18 80 18 80 20.6 87 Is the regression slope significantly different from 0 at the 5% significance level? Report the test statistic, critical value, and p-value. You do not have to perform all steps of the hypothesis test.
Researchers wished to know if they could conclude that two populations of infants differ with respect to mean age at which they walked alone. The following data (ages in months) were collected: Sample from population A: Sample from population B: 9.5, 10.5, 9.0, 9.75, 10.0, 13.0, 10.0, 13.5, 10.0, 9.5, 10.0, 9.75 12.5, 9.5, 13.5, 13.75, 12.0, 13.75, 12.5, 9.5, 12.0, 13.5, 12.0, 12.0 What should the researchers conclude? Let a = .05.
3. In a bar graph of qualitative data, the highest bar always corresponds to that data's А. Мean В. Median С. Мode D. Range E. Variance 4. If the data is skewed right, which of the following would you expect to be true? A. Mean > Median B. Mean < Median C. Mean = Median
C. An agricultural researcher wants to compare the mean numbers of pods between three plot types (Liberty, No Till and Chisel Plowed). For each plot type, he records 7 measurements of the number of pods. Liberty 37 31 36 35 43 37 38 No Till 34 30 38 27 40 42 39 Chisel Plowed 32 37 24 23 32 34 36 Using a 0.05 level of significance, test the hypothesis that the actual mean numbers of pods are equal across the three plot types.
A violin student records the number of hours she spends practicing during each of nine consecutive weeks: 6.2 5.0 4.3 7.4 5.8 7.2 8.4 1.2 6.3 What is the mean number of hours spent practicing per week during this period? a. 6.20 hours b. 6.15 hours c. 8.40 hours d. 5.76 hours
A health educator wants to evaluate the effect of a dental film on the frequency with which children brush their teeth. A random selection of 8 children is used for the experiment. First, a baseline of the number of times the children brush their teeth over a month’s period is established. Next, the children are shown the dental film and again the number of teeth brushings are recorded for a month. The following data are recorded: Subject 1 2 3 4 5 6 7 8 After Film 28 29 25 30 25 27 28 24 Baseline 25 28 22 30 26 24 25 22 What is the nondirectional alternative hypothesis? df = ∑ D2 = __ Dobt = µD = SSD =
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An experiment was conducted to determine if exposure to an advertisement would change attitude toward a product. Each subject’s attitude before and after exposure to the advertisement was recorded, using a valid ten point scale. The results indicated: Subject Attitude Post Exposure Attitude Pre Exposure 1 6 4 2 8 5 3 6 6 4 4 3 5 7 2 6 6 3 7 9 6 8 7 6 9 8 5 10 8 6 Set up hypotheses and test to determine if the mean attitude toward the product increased as a result of exposure to the advertisement. (Note: these samples must be regarded as dependent, as each subject served as both a control (pre-exposure) and a treatment (post exposure). Fully interpret your result.
Your statistics instructor often ponders the relationship between commute time and job satisfaction while driving back and forth to campus. Your instructor hypothesizes that people with a shorter commute time will have higher degrees of job satisfaction. Randomly sampling 600 Valley commuters, the instructor finds the following data listed in frequencies: Table 2: Commuters by Length of Commute and Job Satisfaction Job Satisfaction Number Who Commute 20 Minutes or Less Number Who Commute 21 to 40 Minutes Number Who Commute 41 Minutes or More Total Number for Each Level of Job Satisfaction Dissatisfied 10 60 140 210 Neutral 45 59 51 155 Satisfied 145 60 30 235 Total Number for Each Commute Time Range 200 179 221 1. Change frequencies to column percentages.

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