Private sector managing directors are of the opinion that 50% of the corporate, government, andaccounting executives of the Financial Accounting Foundation rate a company's cash flow as the mostimportant indicator ofa company's financial health. A survey of 415 corporate, government, andaccounting executives of the FinancialAccounting Foundation found that 278 rated cash flow as themost important indicator of a company's financial health. Assume that the 415 executives constitutea random sample from the population of all executives.The questions follow on the next page.1. Is there sufficient evidence to indicate that the proportion of executives that rate cash flow asthe most important indicator of financial health, differs from the opinion of the private sectormanaging directors?Use a test with level a = 0.05. Interpret your findings.2. Construct a 95% confidence interval for the proportion of all corporate executives who considercash flow the most important measure of a company's financial health. Interpret your results.3. Do the hypothesis test in (1) and confidence interval in (2) arrive at the same conclusion?Explain why.

Given that Sample size n = 415 Number of executives who rated cash flow as the most important…

Answered: 1. Is there sufficient evidence to…

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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You compare the 95% confidence intervals associated with two means and note that they do not overlap. What can you conclude? >a. The null hypothesis can be accepted. >b. There is significant experimental error associated with the data set.>c. The standard errors are not significantly different. >d. The associated means are significantly different.
Intellectual development (Perry) scores were determined for 21 students in a first-year, project-based design course. (Recall that a Perry score of 1 indicates the lowest level of intellectual development, and a Perry score of 5 indicates the highest level.) The average Perry score for the 21 students was 3.27 and the standard deviation was .40. Apply the confidence interval method to estimate the true mean Perry score of all undergraduate engineering students with 90% confidence. Interpret the results.
Does walking lower systolic blood pressure? Driving: x-bar = 125, s = 1, n = 32 Walking: x-bar = 119 miles, s = 1, n = 35 Construct a 95% confidence interval 1. What are the Degrees of Freedom on our data? 2. What is the Upper Limit of the Confidence Interval? 3. What is the Lower Limit of the Confidence Interval? 4. Based on your data, does walking lower systolic blood pressure?
What is the difference between confidence interval for proportion and confidence interval for mean?
PROBLEM: A psychologist asks a random sample of 30 female adolescents and a separate, random sample of 30 male adolescents how much time they spend communicating with others online on an average day. She compares the time spent communicating online of female adolescents with that of male adolescents. In your project include: The problem and data. Calculate and interpret the correct 90% confidence interval for the mean difference in the two groups average time spent communicating online. (Use the 4 steps) Preform the correct significance test to test the claim that females spend more time than males communicating online. Use a level of significance of 0.05 and then use a level of significance of 0.10. Explain your results for each alpha. (Use the 4 steps) Answer the initial question and explain how you should use the confidence interval AND significance test to answer it. Review the rubric to make sure you include all necessary components. 1. Data: Hours…
The EPA tests cars for city miles per gallon (mpg). For one model, a sample of 16 cars were tested for mpg, the results follow. 28 25.7 25.8 28 28.5 29.8 30.2 30.4 26.9 28.3 29.8 27.2 26.7 27.7 29.5 28 Find the 95% confidence interval for mean mpg. Find the 99% confidence interval for mean mpg.
Several years ago, 35% of parents who had children in grades K-12 were satisfied with the quality of education the students receive. A recent poll asked 1,195 parents who have children in grades K-12 if they were satisfied with the quality of education the students receive. Of the 1,195 surveyed, 483 indicated that they were satisfied. Construct a 99% confidence interval to assess whether this represents evidence that parents' attitudes toward the quality of education have changed. What are the null and alternative hypotheses? Ho: p versus H,: p (Round to two decimal places as needed.)
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a. interpret the corresponding 95% confidence intervals for both Birth weight and Age. b. What is the predicted average SBP of an infant born with birth weight 8lbs (128oz) measured at 3 days old? c. Calculate the Pearson correlation between Age and Birth weight, and test if this correlation is significant at the 0.05 level. Does this answer surprise you, why or why not?
Report an appropriate hypothesis test for a positive linear relationship and use a 5% significance level. Explain the potential error in words, in context. In the answer options below I have used the phrase “a certain relationship” because I don’t want to give away exactly what type of relationship it is. Group of answer choices We would be accepting that there was a certain relationship between Sale amount and Tip when actually there wasn’t. We would not be accepting that there was a certain relationship between Sale amount and Tip when indeed there wasn’t. We would not be accepting that there was a certain relationship between Sale amount and Tip when actually there was. We would be accepting that there was a certain relationship between Sale amount and Tip when indeed there was.
An Internet retailer would like to investigate the relationship between the amount of time in minutes a purchaser spends on its Web site and the amount of money he or she spends on an order. The table to the right shows the data from a random sample of 12 customers. Construct a 99% confidence interval for the regression slope. Construct a 99% confidence interval for the slope. LCL = and UCL = (Round to three decimal places as needed.) C Time 20 12 28 22 1 13 Order Size $71 $23 $93 $198 $54 $35 Time 5 37 8 37 25 8 Order Size $57 $360 $122 $161 $72 $248

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