MyOpenMath b My Que A health professional obtains records for 34 patients who have undergone a certain surgical procedure and finds the average length of stay is 2.2 days with a standard deviation of 1.6 days. Using a = 0.01, is there evidence to suggest the actual average length of stay for this surgical procedure is 2 days? What are the hypotheses? Ho:µ = 2 vs H1: µ # 2 Ho:μ= 2.2 s H :μή 22 O Họ:i = 2 vs H1:ē + 2 O Ho: = 2.2 vs H1:ē + 2.2 Calculate the test statistic using the correct letter. z = - 0.73 Ot = - 0.73 t = 0.73 z = 0.73 Determine the critical values. O+2.728 O+2.576 O+2.724 O+2.326 O+2.733 O+2.445 O+2.438 State your decision. O Accept Ho O Reject Ho O Fail to reject Ho

MyOpenMath b My Que A health professional obtains records for 34 patients who have undergone a certain surgical procedure and finds the average length of stay is 2.2 days with a standard deviation of 1.6 days. Using a = 0.01, is there evidence to suggest the actual average length of stay for this surgical procedure is 2 days? What are the hypotheses? Ho:µ = 2 vs H1: µ # 2 Ho:μ= 2.2 s H :μή 22 O Họ:i = 2 vs H1:ē + 2 O Ho: = 2.2 vs H1:ē + 2.2 Calculate the test statistic using the correct letter. z = - 0.73 Ot = - 0.73 t = 0.73 z = 0.73 Determine the critical values. O+2.728 O+2.576 O+2.724 O+2.326 O+2.733 O+2.445 O+2.438 State your decision. O Accept Ho O Reject Ho O Fail to reject Ho

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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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Iq and lead exposure. A sample of subjects with low lead levels in their blood was taken and another random sample was taken with high levels of lead in their blood. Use a 0.05 significant level to test claim that iq score of people p le w low lead levels is higher than the mean iq score of people w higher lead levels. Use p value approach LLL N =78 SAMPLE MEAN=92.88 S=15.34 HLL N=21 SM= 86.90 S=8.99
A weight loss program claims that program participants have a mean weight loss of at least 12 pounds after 1 month. You work for a medical association and are asked to test this claim. A random sample of 30 program participants and their weight losses (in pounds) after 1 month is listed in the table below. Assume the population standard deviation 4. At α = 0.03, do you have enough evidence to reject the program's claim? Complete parts (a) through (e). 5.1 5.2 6.5 6.9 7.2 8.7 9.2 9.4 9.5 9.7 11.1 11.2 11.6 11.6 11.9 (a) Identify Ho and H₂. Choose the correct answer below. O A. Ho: μ ≥ 12 H₂: 12 7.3 7.4 9.7 10.1 12.4 12.5 O E. Ho: μ 12 H₂:μ≤ 12 O D. Ho: μ#12 H₂:μ = 12 OF. Ho: H=12 H₂:μ#12 8.5 10.6 15.2
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ork Home | Account Settings I Support | Help | Log O Forums Calendar Gradebook 2020> Assessment Safari Williams Due Sun 04/05/2020 10:59 pr For a 4-unit class like Statistics, students should spend average of 12 hours studying for the class. A survey was done on 29 students, and the distribution of total study hours per week is bell-shaped with a mean of 13 hours and a standard deviation of 3.1 hours. Use the Empirical Rule to answer the following questions. a) 68% of the students spend between 11.4 hours and 12.6 ours on Statistics each week. Enter an integer or decimal number [more.] b) 95% of the students spend between hours and hours on Statistics each week. c) 99.7% of the students spend between hours and hours on Statistics each week. Hint: Textbook Measures of Spread Get Help: Points possible: 1 License This is attempt 1 of 3. Submit F5 F7 F9 FIO FII F12 K4
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The average salary in this city is $43,200. Is the average more for single people? 47 randomly selected single people who were surveyed had an average salary of $49,485 and a standard deviation of $16,570. What can be concluded at the αα = 0.10 level of significance? For this study, we should use Select an answer z-test for a population proportion t-test for a population mean The null and alternative hypotheses would be: H0:H0: ? μ p Select an answer ≠ < = > H1:H1: ? p μ Select an answer > ≠ = < The test statistic ? z t = (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 Select an answer reject fail to reject accept the null hypothesis.
* Question Completion Status: OC. 0.0099 d. 0.0918 QUESTION 3 EPA fuel economy estimates for automobile models tested recently predicts a mean of 24 mpg and a standard deviation of 6 mpg. Assume that a Normal model applies, N(24, 6 ). What mpg for the automobiles would be the cutoff value for the lowest 10% of the mpg's (the 10th percentile of gas mileage)? O a. 12.80 mpg O b. 10.00 mpg O c. 31.38 mpg O d. 16.32 mpg QUESTION 4
Babies: A sample of 25 one-year-old girls had a mean weight of 24.1 pounds with a standard deviation of 4.3 pounds. Assume that the population of weights is normally distributed. A pediatrician claims that the standard deviation of the weights of one-year-old girls is greater than 7 pounds. Do the data provide convincing evidence that the pediatrician's claim is true? Use the =α0.05 level of significance.
omeb... Kaiser Permanent... /courses/27422/discussion_topics/357765 F2 W Instructions 30F Required parameters: Confidence level: F #3 0.95 Standard deviation: 7.9 E Number of Hours Worked An economic researcher is collecting data about grocery store employees in a county. The data listed below represents a random sample of number of hours worked by 40 employees for several grocery stores in the county. Assume that the population standard deviation is 7.9 hours. An economics researcher wants to estimate the mean number of hours worked by all grocery store employees in the county. How many employees must be included in the sample to be 95% confident that the sample mean is within 1.5 hours of the population mean? 30, 26, 33, 26, 26, 33, 31, 31, 21, 37, 27, 20, 34, 35, 30, 24, 38, 34, 39, 31, 22, 30, 23, 23, 31, 44, 31, 33, 33, 26, 27, 28, 25, 35, 23, ,32, 29, 31, 25, 27 Find the minimum sample size to estimate the population mean hours worked using StatCrunch. 1. Enter data in…
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Is it more expensive to live in California or Florida? Monthly cost of living expenses for California are approximately Normal with mean μC=$10,800��=$10,800 and standard deviation σC=$3,200��=$3,200. Monthly cost of living expenses for Florida are approximately Normal with mean μF=$8,500��=$8,500 and standard deviation σF=$2,700.��=$2,700. Suppose we select independent SRSs of 16 residents of California and 9 residents of Florida and calculate the sample mean monthly cost of living, x¯C�¯� and x¯F�¯�. a. What is the shape of the sampling distribution of x¯C−x¯F?�¯�−�¯�? Why? b. Find the mean and standard deviation of the sampling distribution of x¯C−x¯F�¯�−�¯�. c. Calculate the probability that the average monthly cost of living expense of the 16 randomly selected California residents is less than the average monthly cost of living expense of the 9 randomly selected Florida residents.
In a test, the average score is 100. You believe that the average score for your class is higher. You took a sample of 30 students. The average score for this group is 140 with a standard deviation of 15. Test the hypothesis that the average score is greater. Use a = The rejection region for the test statistic is... .05. less than -1.959963985 and greater than 1.959963985 less than - 2.045229642 and greater than 2.045229642 less than - 1.644853627 and greater than 1.644853627 none of the above O O O O