QUESTION 12A researcher is interested in determining if the claim that a medical procedure takes onlv 1.5 hours is correct.He takes a sample of data from 10 hospitals and finds that the average time for the procedure is 2 hours with astandard deviation of 1 hour.Which of the following would be an appropriate null hypothesis?the average time for qmpletion of the procedure is 1.5 hours.O the average time for completion of the procedure is greater than 1.5 hours.O the average time for completion of the procedure is less than 1.5 hours.O the average time for completion of the procedure is not equal to 1.5 hours.Save All AnsvClick Save and Submit to save and submit. Click Save All Answers to save all answers.Rair) 耳O search99+HEWLETT PACKARD

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Answered: A researcher is interested in…

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 battery manufacturer claims that the lifetime of a certain type of battery has a population mean of 40 hours and a standard deviation of 5 hours. Let Y represent the mean lifetime of the batteries in a simple random sample of size 100. If the claim is true, what is P(X < 36.7)? a. b. Based on the answer to part (a), if the claim is true, is a sample mean lifetime of 36.7 hours unusually short? If the sample mean lifetime of the 100 batteries were 36.7 hours, would you find the manufacturer's claim to be plausible? Explain. c. d. If the claim is true, what is P(X < 39.8)? Based on the answer to part (d), if the claim is true, is a sample mean lifetime of 39.8 hours unusually short? e. If the sample mean lifetime of the 100 batteries were 39.8 hours, would you find the manufacturer's claim to be plausible? Explain. f.
A researcher selected a sample of 156 former student leaders from a list of graduates of a large university. She discovered that it had taken an average of 4.97 years for the graduates to finish their degrees, with a standard deviation of 1.23. The average for the entire student body is 4.56 years. Is the difference statistically significant? Alpha = 0.05; two-tailed test.
A random sample of 23 bags of apples (marked as 10 pounds each) received by a large grocery chain tested out as having a mean of 9.2 pounds with a variance of 2.56 pounds. Test whether the true mean of all bags is under 10 pounds. Set up hypotheses. Perform the appropriate test by showing your formula. Interpret the results using a Type I (alpha) error of .05. Also provide the p value here. Also construct a 95% confidence interval around your sample mean (X bar) that should contain the true mean (mu). Also interpret this interval.
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The manager of a computer retails store is concerned that his suppliers have been giving him laptop computers with lower than average quality. His research shows that replacement times for the model laptop of concern are normally distributed with a mean of 3.7 years and a standard deviation of 0.5 years. He then randomly selects records on 52 laptops sold in the past and finds that the mean replacement time is 3.6 years. Assuming that the laptop replacement times have a mean of 3.7 years and a standard deviation of 0.5 years, find the probability that 52 randomly selected laptops will have a mean replacement time of 3.6 years or less. P(M3.6 years) = Enter your answer as a number accurate to 4 decimal places. NOTE: Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted. Based on the result above, does it appear that the computer store has been given laptops of lower than average quality? Yes. The probability of this data is unlikely to have occurred…
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A health professional obtains records for 33 patients who have undergone a certain surgical procedure and finds the average length of stay is 3.23 days with a standard deviation of 1.58 days. Using α=0.10 is there evidence to suggest the actual average length of stay for this surgical procedure is 3 days? The correct conclusion is that we Select an answer: (can, maybe can, cannot) conclude that the average length of stay of Select an answer: (all, sampled, randomly selected) surgeries of this type Select an answer: (is less than, is is different from, is more than) Select an answer: (3.23, 0.85, 3) days.What level of concern do you have for the validity of your results? Moderate - the original data is not normally distributed which is an assumptions violation Low - our sample size is near 30, so while that's likely sufficient for X¯ to be approximately normally distributed, seeing that the original data isn't extremely skewed would make us feel more comfortable Extreme - we…
The average salary in this city is $47,400. Is the average less for single people? 70 randomly selected single people who were surveyed had an average salary of $45,379 and a standard deviation of $13,700. What can be concluded at the αα = 0.05 level of significance? For this study, we should use Correct The null and alternative hypotheses would be: H0:H0: Correct Correct H1:H1: Correct The test statistic = (please show your answer to 3 decimal places.) The p-value = (Please show your answer to 4 decimal places.) The p-value is αα Based on this, we should the null hypothesis. Thus, the final conclusion is that ... The data suggest that the population mean is not significantly less than 47,400 at αα = 0.05, so there is statistically insignificant evidence to conclude that the population mean salary for singles is less than 47,400. The data suggest that the populaton mean is significantly less than 47,400 at αα…

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