When testing the effectiveness of a medicine, 57.3% of those taking the medicine noticed an improvement in their health. For a random sample of 392 individuals, find the mean, variance, and standard deviation for the number of individuals who will not notice an improvement in their health. Show your work to receive credit.
Solution :
Given that,
p = 0.573
q = 1 - p =1-0.573=0.427
n = 392
Mean = = n * p = 392*0.573=224.616
variance 2= n * p * q = 392*0.573*0.427=95.9110
Standard deviation = = n * p * q = 392*0.573*0.427=9.7934
When testing the effectiveness of a medicine, 57.3% of those taking the medicine noticed an improvement...
A random sample of size 13 is selected from men with hypertension. For each person, systolic blood pressure was measured right before and one hour after taking the medicine. The mean reduction of the blood pressures was 10.1 and the standard deviation of the difference was 11.2. In testing if there is sufficient evidence to conclude that the hypertension medicine lowered blood pressure, what is the p-value (round off to fourth decimal place)? Assume normal population. 1 pts Question 4...
show all work. say a researcher is interested in testing the effectiveness of a new stress reduction method. She thinks, or predicts based on previous research, that the new method should reduce stress. one randonmly selected person (our subject) is trained in this method and his stress is measured (low values mean low stress). It is known that stress level of people in the general population has a mean of 40 and a standard deviation of 10. the score of...
Dute. Harper's Index. FULL. 20. Tossing Coins Find the mean, variance, and standard deviation for the number of heads when 10 coins are tossed. Sout. 67 Watching Fireworks A survey found that 21% of Americans watch fireworks on television on July 4. Find the mean, variance, and standard deviation of the number of individuals who watch fireworks on television on July 4 if a random sample of 1000 Americans is selected. Source: USA Snapshot, USA TODAY. nt of
Quiz #5 1. True or False. Justify for full credit. (a) The normal distribution curve is always symmetric to 0. (b) If the variance from a data set is zero, then all the observations in this data set are identical. (c) P(A OR A complement) =1, where A complement is the complement of A. (d) In a hypothesis testing, if the p-value is less than the significance level α, we do not have sufficient evidence to reject the null hypothesis....
You are the human resources director for a corporation and want toimplement a health improvement program for employees to decreaseemployee medical absences. You perform a six-month study with arandom sample of employees. Your goal is to decrease absences by50%. (Assume all data are normally distributed.) EXERCISES1. Preliminary ThoughtsYou got the idea for this health improvement program from anational survey in which 75% of people who responded said theywould participate in such a program if offered by their employer.You randomly select 60...
26. What is the correct interpretation of the coefficient on price? a. A decrease in price is correlated with a decrease in cigsales. b. An increase in price is correlated with a decrease in cigsales. c. An increase in price is correlated with an increase in cigsales. d. An increase in cigsales causes a decrease in price. Answer the following questions in the space provided below. You must show your work to receive full credit. Answers that do not include...
1. For each of the following random variables, determine whether the variable is quantitative or qualitative. Further classify those variables as discrete/continuous or ordinal/nominal (a) Number of telephones per householod (b) Whether there is a fax machine in the household (c) Length (in minutes) of longest local call per month (d) Total time spent on online purchases in a month (e) Educational level of a person 2. It is believed that exercising can lower blood pressure. A medical researcher who...
A. B. C. D. Construct a confidence interval suitable for testing claim that students taking non proctored tests get higher mean score than those taking proctored tests. ___<µ1 - µ2 < ____ Yes/No____ because the confidence interval contains only positive values/only negative values/zero ______. E. Construct a confidence interval suitable for testing claim that students taking non proctored tests get higher mean score than those taking proctored tests. ___<µ1 - µ2 < ____ Yes/No____ because the confidence interval contains only...
A day November 11, 2019 at 2:00 PM Late exam will have 15 points acted No w Noon. Please show All Work for any partial credit. If necessary to your final write your wees and we e that all populations have a normal distribution. You will only receive credit for the originale Botocopy). For the questions involving hypothesis testing you follow each of the steps in the de Number each of the steps from page 394. You may e Muhematian....
PROBLEM SET 2 (Due date: after the class on June 11) 1. Suppose that the mean price per liter of regular gas(oline) sold in Korea is 1,200 Won Now assume the population mean price per liter is 1, 200, and the population standard deviation is o = 400. Suppose that a random sample of 500 gas stations will be selected, and a sample mean price per liter will be computed for data collected from the 500 gas stations. (a) Show...