MINDTAP PSYCHOLOGY FOR GRAVETTER/FORZAN
5th Edition
ISBN: 9781305264953
Author: Forzano
Publisher: IACCENGAGE
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Textbook Question
Chapter 15.5, Problem 11LO
Describe the two basic concerns with the calculation of split-half reliability and explain how these concerns are addressed by the Spearman-Brown formula, the K-R 20, and Cronbach’s alpha.
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Previous research showed that 15% percent of teenagers between the ages of 13 and 17 smoke. A study was conducted to examine the current proportion of US teenagers between the ages of 13 and 17 who smoke. A survey asked a random sample of 785 teenagers between the ages of 13 to 17 if they smoke. 71 of the surveyed teenagers responded that they smoke.
The information above is for the question below.
The following equation was estimated by OLS:
Unipa = 1.392 - 0.0135 psperc + 0..00148 sat
n = 4,137, R2 = 0.273
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sixteen class (defined so that, for example, psperc =5 means the top 5% of the
class), and sat is the combined maths and verbal scores on the student
achievement test.
Previous research showed that 15% percent of teenagers between the ages of 13 and 17 smoke. A study was conducted to examine the current proportion of US teenagers between the ages of 13 and 17 who smoke. A survey asked a random sample of 785 teenagers between the ages of 13 to 17 if they smoke. 71 of the surveyed teenagers responded that they smoke.
The information above is for the question below.
Chapter 15 Solutions
MINDTAP PSYCHOLOGY FOR GRAVETTER/FORZAN
Ch. 15.1 - Define the two general categories of statistics,...Ch. 15.1 - Prob. 2LOCh. 15.2 - Prob. 3LOCh. 15.2 - Prob. 4LOCh. 15.2 - Prob. 5LOCh. 15.2 - Prob. 6LOCh. 15.3 - Prob. 7LOCh. 15.3 - Prob. 8LOCh. 15.3 - Explain how sample size and sample variance...Ch. 15.4 - Identify the characteristics that differentiate...
Ch. 15.5 - Describe the two basic concerns with the...Ch. 15.5 - Describe the basic concern with measuring...Ch. 15 - In addition to the key words, you should also be...Ch. 15 - Describe the two general purposes of statistics...Ch. 15 - Explain the difference between a statistic and a...Ch. 15 - Construct a frequency distribution histogram or...Ch. 15 - Under what circumstances are the median and the...Ch. 15 - For a distribution with a mean of 70 a. If the...Ch. 15 - A researcher obtains a correlation of r = -0.72...Ch. 15 - Prob. 8ECh. 15 - Briefly explain what is meant when a researcher...Ch. 15 - Prob. 10ECh. 15 - Describe the relationship between the alpha level...Ch. 15 - Explain how increasing the size of the sample can...Ch. 15 - Prob. 13ECh. 15 - Identify the appropriate hypothesis test for each...Ch. 15 - Prob. 15ECh. 15 - Prob. 16ECh. 15 - Prob. 1EACh. 15 - Make up a set of 10 pairs of scores (X and Y...
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- Suppose the following estimated equation. Standard errors are in parentheses. Y = 3638.25 + 0.148X, + 11.13X2 + 3.20X3 n = 400 R2 = 0.465 |(112.28) (0.017) (4.88) (1.45) You are to test if the variable of X3 shows a significant positive impact on the model. Answer the followings. a. State the hypotheses. b. What is the p-value? C. Should the variable of X3 be included in the model? Explain.arrow_forward4. For a population with u = 40 and o = 8: a. Find the z-score for each of the following X values. (Note: You should be able to find these values us- ing the definition of a z-score. You should not necd to use a formula or do any serious calculations.) X-44 X= 38 X-48 X= 34 X-56 X 32 %3D b. Find the score (X value) that corresponds to each of the following Z-scores. (Again, you should not need a formula or any serioUS calculations.) N=1.00 こ=-0.50 -0,25 1.25 N= 1.50 = -250arrow_forwardShannon conducts a study and tells you that when she calculated Cohen's d , it was 0.00. What conclusion would you reach about the effects of her independent variable?arrow_forward
- Please solve & show steps...arrow_forwardFor 7 and 8, use the following information: We run a regression test, regressing test score on hours studied, and find out that b. = 45 while b₁ = 10. 7. In words, interpret bo. 8. In words, interpret b₁. Which test would you use to answer each of the following research questions? Specify the test type as well as the null and alternative hypotheses. 9. Does life expectancy (in years) differ between smokers and non-smokers? 10. Is there a relationship between US News college ranking (eg 1, 2, 3, 4...) and starting salary after graduation (in dollars)? 11. Is a students GPA when they graduate high school related to their GPA when they graduate college? 12. Is there a relationship between eating breakfast (eating breakfast vs. not eating breakfast) and weight (overweight, underweight, or healthy weight)?arrow_forwardHow would I solve this problem to find the z value and p-value?arrow_forward
- AUA wants to know whether recent alumni students from MBA class earn significantly more than recent alumni from BAB class. They take a sample of several students and ask the amount of their monthly salaries in USD (Sheet 32). What can AUA conclude at alpha=0.05? Sheet 32 MBA BAB 515 300 450 420 620 380 630 450 570 420 590 490 750 510 560 470 480 530 250 570 320 480 450 620 625 190 350 280 450 350 570 250 Select one: a. t(stat)=1.92, which is greater than t(cr)=1.7, therefore, we can conclude that MBA graduates earn more BAB graduates. b. t(stat)=1.89, which is greater than t(cr)=1.75, therefore, we can conclude that MBA graduates earn more BAB graduates. c. t(stat)=2.07, which is greater than t(cr)=1.69, therefore, we cannot conclude that MBA graduates earn more BAB graduates. d. t(stat)=2.07, which is greater than t(cr)=1.69, therefore, we can conclude that MBA graduates earn more BAB graduates.arrow_forwardSolve the following problem according to the proper test to be used: The table shows the hours of relief provided by two analgesic drugs (A and B) in the same 12 patients suffering from arthritis. Is there any evidence that one drug provides longer relief than the other? Use alpha = 0.05. Patient 1 2 3 4 5 6 7 8 9 10 11 12 Drug A 3.5 5.7 2.9 2.4 9.9 3.3 16.7 6.0 3.8 4.0 9.1 20.9 Drug B 2.0 3.6 2.6 2.6 7.3 3.4 14.9 6.6 2.3 2.0 6.8 8.5arrow_forwardIn Utah, it is illegal for a person to drive if their blood alcohol level (BAC) is higher than 0.05. For a typical male, their liver can decrease BAC by 0.015 per hour. If a typical male has a BAC of 0.08 at 6pm and consumes no more alcohol, what is his predicted BAC at 7:30pm?When do you predict a typical male in part a. will have a BAC of 0?If Peter had a BAC of 0.08 at 7pm, do you think he will be legal to drive at exactly 9:00pm? Explain your answer in 1-2 sentencesarrow_forward
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