The explanatory variables is are a body weight in

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Understandable Statistics: Concepts and Methods
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Chapter 6 / Exercise 3
Understandable Statistics: Concepts and Methods
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59.The explanatory variable(s) is (are) A.body weight in kilograms. B.dosage in milligrams of ephedrine. C.number of revolutions of the exercise wheel. D.effect of ephedrine on the rat. E.species of rat. F.no ephedrine versus treatment of ephedrine.
60.The individual in this study is
61.This study is an example of
62.Does this study incorporate randomization?
63.Does this study incorporate replication? A.Yes B.No
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Understandable Statistics: Concepts and Methods
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Chapter 6 / Exercise 3
Understandable Statistics: Concepts and Methods
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Expert Verified
64.Does this study incorporate control or comparison?
The remaining questions are True or False: 65.Most statisticians prefer bar graphs to pie charts because the reader more accurately visualizes the information presented. 66.Standard deviation is a measure of variability. 67.Range equals the largest observation minus the smallest observation. 68.Interquartile range is all of the values between Q1and Q3. 69.All lurking variables are confounded variables. 70.All voluntary response samples are samples of convenience. 71.All samples of convenience are non-probability samples. 72.Even probability samples can be biased due to poor interviewing and/or poorly worded questions. 73.x represents the mean of a population. 74.s represents the standard deviation of a sample.
Answers:
A
35.A 36.C 37.D 4.C - Categorical data is described using percents or proportions.38.D 39.B – A placebo effect is when a positive response is measured without actually receiving treatment.65.True 66.True 5.B - small sample size.67.True 6.B 68.False – IQR= Q3-Q1(it is a single number) 7.D 8.A 40.C 69.False – see answer for #13 9.A 41.D 70.True 10.B 42.E 71.True 11.E 43.C 72.True 12.C 44.A 73.False - μis the mean of a population (x is for a sample).13.D – Confounding is when you cannot separate the effects of the explanatory variable on the response from the effects of a lurking variable on the response.45.D 46.B 47.C 74.True 48.A 49.C 50.D 51.C 14.D 52.E 15.D 53.C 16.C – The unit of measure for z-scores are standard deviation units.54.B – When adding data points at the mean the std. deviation will decrease while the mean will stay the same.17.B 18.B 19.B 55.D – When adding data to the edge of the distribution both the mean and std. deviation are affected.20.A 21.C 22.C 23.A – 24 minutes is the mean of the population of all college freshmen.56.D – Both the mean and median are affected when data points are added to the edge of the distribution.24.E – 99.7% of the population values are between 3 standard deviations above and below the mean. 57.C – The standard deviation is not affected if the same number is added to all the points.25.A 26.C 27.A 58.C 28.B 59.F 29.C 60.C 30.C 61.C 31.B

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