Name:California State University, FresnoDS 123Class Work #4Problem I. The administrator of a physical therapy facility has found that postoperative performánce scores ona knee flexibility test have tended to follow a normal distribution with a standard deviation of 4. For a simplerandom sample of 10 patients who have recently had knee surgery, the scores are:101, 92, 94, 88, 52, 93, 76, 84, 72, 981. What is the point estimate for:a. , the mean postoperative knee flexibility rating?la.b. o, the standard deviation for the knee flexibility rating?lb.2. What is the standard error?Iev2.e them3. What is the appropriate yalue of the z for a 95% confidence interval?3.4. What are the lower and upper bounds for the 95% confidence interval on the mean?Upper bound:Lower bound:d8 goitesop nounlenoo nog fsvini comabitnoo adi lo nódernalni ledareavioProblem II. Every February 2, crowds gather at Gobbler's Knob, in Punxsutawney, Pennsylvania, where agroundhog, Punxsutawney Phil, is about to make the most celebrated weather forecast of the year. Has springsprung when Phil emerges from his burrow and doesn't see his shadow? Or should he scurry back into hisburrow for six more weeks of winter weather if skies are clear and fair? Below is a table showing Phil's recordfrom 1988 through 2004.U.S. NATIONALTEMPERATURE VERDICTAboveYEARSHADOW20042003YESWrongWrongWrongWrongWrongCorrectYESConfeelnce mfenalAbove2002YESAbove2001YESAbove20001999YESNOAboveAboveAboveAbove19981997YESWrongCorrect17-1NO1996YESAboveAboveWrongCorrect1995NO1994YESBelowCorect199319921991YESBelowAboveAboveAboveCorrectWrongWrongCorrectCorectYESYES1990NO19891988YESBelowNOBelowWrong

Data is given normally distributed Standard deviation = 4 We have to answer for mentioned questions.…

Answered: Problem I. The administrator of a…

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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3. A certain breed of cat has weights which are normally distributed with a mean of 6.2 pounds, and a standard deviation of .8 pounds. What would be the z-score of a cat which weighed 7.4 pounds? 1.50 1.20 -1.50 -1.20
For a data set of the pulse rates for a sample of adult females, the lowest pulse rate is 33 beats per minute, the mean of the listed pulse rates is x = 71.0 beats per minute, and their standard deviation is s = 14.8 beats per minute. a. What is the difference between the pulse rate of 33 beats per minute and the mean pulse rate of the females? b. How many standard deviations is that [the difference found in part (a)]? c. Convert the pulse rate of 33 beats per minutes to a z score. d. If we consider pulse rates that convert to z scores between -2 and 2 to be neither significantly low nor significantly high, is the pulse rate of 33 beats per minute significant? a. The difference is (Type an integer or a beats per minute. decimal. Do not round.) b. The difference is standard deviations. (Round to two decimal places as needed.) c. The z score is z = (Round to two decimal places as needed.) d. The lowest pulse rate is significantly high. significantly low. not significant. C
Tips given to taxi drivers form a substantial part of their income. They also serve as a loose metric of service quality that can be useful for taxi companies. An analysis of a large dataset shows that the tips given (as a percentage of taxi fares) are normally distributed with mean 21.3% and standard deviation 7.5%. Furthermore, tips received for different trips are independent from each other. taxi driver expects to do 2000 trips next year. For approximately how many of these trips will he receive a tip over 25%?
Tipping. In the article “Are Christian/Religious People Poor Tippers?” (Journal of Applied Social Psychology, Vol. 43, Issue 5, pp. 928–935), M. Lynn and B. Katz report that, for customers who receive bad service, the mean percentage tip is 8.56% of the bill with a standard deviation of 5.37%. Let x represent the percentage of the bill that a customer tips when he or she receives bad service. a. What percentage of tips for bad service are at least 0%? b. Assuming that x is approximately normally distributed, use normalcurve areas to determine the approximate percentage of tips for bad service that are at least 0%. c. Based on your results from parts (a) and (b), do you think that the percentage of the bill that a customer tips when he or she receives bad service is approximately a normally distributed variable? Explain your answer.
Diastolic blood pressure. In a study of 500 men, diastolic blood pressure was found to be approximately normally distributed, with a mean of 82 millimeters (mm) of mercury and standard deviation of 10 millimeters. a. Use the 68–95–99.7% rule to determine what percentage of the test group had a diastolic pressure between 72 millimeters and 92 millimeters of mercury. b. Use your answer to part a to determine how many men in the test group had a diastolic pressure between 72 millimeters and 92 millimeters of mercury.
For a study of two independent samples: Sample 1: mean = 18.1, standard deviation = 2.5, sample size = 30; Sample 2: mean = 19, standard deviation = 2.0; sample size : 54. = a. Calculate t-obtained ONLY (do not interpret). a. How many degrees of freedom are there?
For a data set of the pulse rates for a sample of adult females, the lowest pulse rate is 35 beats per minute, the mean of the listed pulse rates is x = 71.0 beats per minute, and their standard deviation is s= 14.2 beats per minute. a. What is the difference between the pulse rate of 35 beats per minute and the mean pulse rate of the females? b. How many standard deviations is that [the difference found in part (a)]? c. Convert the pulse rate of 35 beats per minutes to a z score. d. If we consider pulse rates that convert to z scores between -2 and 2 to be neither significantly low nor significantly high, is the pulse rate of 35 beats per minute significant? a. The difference is beats per minute. (Type an integer or a decimal. Do not round.) b. The difference is standard deviations, (Round to two decimal places as needed.) c. The z score is z=. (Round to two decimal places as needed.) d. The lowest pulse rate is
For a data set of the pulse rates for a sample of adult females, the lowest pulse rate is 37 beats perminute, the mean of the listed pulse rates is x=77.0 beats per minute, and their standard deviation is s=24.8 beats per minute. a. What is the difference between the pulse rate of 37 beats per minute and the mean pulse rate of the females? b. How many standard deviations is that [the difference found in part (a)]? c. Convert the pulse rate of 37 beats per minutes to a z score. d. If we consider pulse rates that convert to z scores between −2 and 2 to be neither significantly low nor significantly high, is the pulse rate of 37 beats per minute significant?
For a data set of the pulse rates for a sample of adult females, the lowest pulse rate is 34 beats per minute, the mean of the listed pulse rates is x=72.0 beats per minute, and their standard deviation is s=13.8 beats per minute. a. What is the difference between the pulse rate of 34 beats per minute and the mean pulse rate of the females? b. How many standard deviations is that [the difference found in part (a)]? c. Convert the pulse rate of 34 beats per minutes to a z score. d. If we consider pulse rates that convert to z scores between −2 and 2 to be neither significantly low nor significantly high, is the pulse rate of 34 beats per minute significant?
Answer part c and d frq styled
Answer Q.1
Among applicants to a school of public health, the average GRE writing score was about 3, the SD was about 0.5, and the lowest score was 2.5. True or False: the GRE writing scores follow the normal curve. Select one: True False Brevious page Next page C

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