To investigate the tradeoff between time to work and time to sleep, thefollowing equation is estimated:sleep 3,600+0.128totwrk -10.08educ+2.10age6.(112.14) (0.016)n 700, R2 0.102Standard errors are in the parentheses(1) Is either educ or age individually significant at the 5% level? Show yourwork(4.58)(1.35)(2) Dropping educ and age from the equation givessleep 3,780-0.104totwrk(52.04) (0.012)700, R2 0.099nAre educ and age jointly significant in the original equation at the 5% level?Justify your answer

6 1. Testing for independent variable “educ”: State the null and alternative Hypotheses: Null…

Answered: To investigate the tradeoff between…

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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Andy Roddick, a former professional tennis player believes he can make 70% of his first serves that are at least 110 mph. His friends believe the percentage should be smaller than 70%. They challenged Andy to do 400 first-serves. Andy successfully served 260 times. The null hypothesis is that he can serve 70% of his first serves. The observed percentage is [A]%. Find the standard error for percentage. Hint: The SD for the box model is The standard error for percentage is [B]%. Round your answer to the nearest tenth of a percent(for example 6.3%) The z-statistic is [C]. Round your answer to two decimal places. The p-value is [D]%. Round your answer to the nearest tenth of a percent(for example 6.3%) If the significance level is set at 5%, do you reject the null hypothesis? Write yes or no. [E] If the significance level is set at 1%, do you reject the null hypothesis? Write yes or no. [F]
A researcher found that the two groups (n=25 in each group) they tested were significantly different from each other with a t-value of 2.91, which has a corresponding p-value of p=.06. Report the findings in APA number format.
A survey of 100 senior citizens was undertaken and it was found that 9 of them had the flu vaccine this year. Do these data suggest that the proportion of senior citizens who get the flu vaccine is significantly less than 12 %? Test at a = 0.10. Round your answers to three decimal places, and round any interim calculations to four decimal places. What is the test statistic? Hint: Make sure you are rounding your answer to three decimal places.
You are conducting a study to see if the proportion of women over 40 who regularly have mammograms is significantly less than 50%. Your sample data resulted in a test statistic of z = - 2.655. Find the p-value accurate to 4 decimal places. p-value =
a1
Use the formula to find the standard error of the distribution of differences in sample means, I1 – X2. Samples of size 110 from Population 1 with mean 82 and standard deviation 14 and samples of size 80 from Population 2 with mean 76 and standard deviation 17 Round your answer for the standard error to two decimal places. standard error = i
A runner states that his average time for running a mile is 6.5 minutes. Given the following times from 8 recent mile runs, test the claim that his actual average is not what he states it to be at the a = 0.05 level of significance. 6.25 6.6 6.8 7.2 6.3 7.0 6.5 6.75
Referring to the above results, choose the correct answer with regards to the 95% confidence interval of the slope of ln(orders): Choose one: a. It is estimated that a 1% increase in orders is expected to increase mean costs by approximately 0.4% up to 1% with 95% confidence b. A 10% increase in orders is estimated to increase mean costs by approximately 4% to 10% taking into account the sales effect with 95% confidence c. The estimated effect of orders on costs varies between 0,4 and 1,0 with 95% confidence d. The 95% confidence interval of the variable ln(orders) is between 0,4 and 1,0.
A repeated measures study with n=26 participants produces a mean difference of M D = 3 points, SS=500 for the difference scores, and t=2.50. Calculate Cohen's d and r square (r2) to measure the effect size for this study.
Suppose we know that the aspirin content of aspirin tablets follows a Normal distribution with standard deviation of o= 5 mg.
A researcher wants to see if there is a difference in APGAR scores of newborns depending on whether the mother smoked during pregnancy or not. She collects data and analyzes the results using SPSS. What is the correct way to report the results in APA style? Question 23 options: t(58) = 3.288, p>.05 t(58) = 3.288, p= .002 t(26.5) = 3.278, p<.05 t(26.5) =3.278, p=.003
Rhino viruses typically cause common colds. In a test of the effectiveness of echinacea, 33 of the 38 subjects treated with echinacea developed rhinovirus infections. In a placebo group, 94 of the 111 subjects developed rhinovirus infections. Use a 0.01 significance level to test the claim that echinacea has an effect on rhinovirus infections. Complete parts (a) through (c) below. a. Test the claim using a hypothesis test. Consider the first sample to be the sample of subjects treated with echinacea and the second sample to be the sample of subjects treated with a placebo. What are the null and alternative hypotheses for the hypothesis test? O A. Ho: P1 #P2 Hy:P1 =P2 O B. Ho: P1 =P2 H1: P1 P2 H1: P1 #P2 Identify the test statistic. (Round to two decimal places as needed.) Identify the P-value. P-value = (Round to three decimal places as needed.) What is the conclusion based on the hypothesis test? the null hypothesis. There sufficient evidence to support the claim that echinacea…

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