Pharmacists at a research institution claim that a certain medicine is 74% effective on people with a particular disease. Use Normal approximation to find the probability that it will be effective in at most 56 of the next 80 trials. [Refer to appropriate distribution table if needed.) O A. 0.2285 OB. 0.2457 OC. 0.2211 OD. 0.2359

Pharmacists at a research institution claim that a certain medicine is 74% effective on people with a particular disease. Use Normal approximation to find the probability that it will be effective in at most 56 of the next 80 trials. [Refer to appropriate distribution table if needed.) O A. 0.2285 OB. 0.2457 OC. 0.2211 OD. 0.2359

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

A researcher expects a treatment to produce an increase in the population mean. Assuming a normal distribution, what is the critical z-score for a one tailed test with a = .01? a. +2.33 b. ±2.89 c.+1.33 d. ±2.33
What is the probability that an observation taken from a standard normal population will have Z values smaller than 0.5 1. 69.15% 2. 50.00%3. 30.85%4.66.67%
You may need to use the appropriate appendix table to answer this question. Suppose that the average price for a gallon of gasoline in the Country A is $3.74 and in Country B it is $3.40. Assume these averages are the population means in the two countries and that the probability distributions are normally distributed with a standard deviation of $0.25 in the Country A and a standard deviation of $0.20 in Country B. (a) What is the probability that a randomly selected gas station in Country A charges less than $3.50 per gallon? (Round your answer to four decimal places.) (b) What percentage of the gas stations in Country B charge less than $3.50 per gallon? (Round your answer to two decimal places.) (c) What is the probability that a randomly selected gas station in Country B charged more than the mean price in the Country A? (Round your answer to four decimal places.)
EmergencyRoomTraffic. Desert Samaritan Hospital in Mesa, Arizona, keeps records of emergency room traffic. Those records reveal that the times between arriving patients have a special type of reverse-J-shaped distribution called an exponential distribution. They also indicate that the mean time between arriving patients is 8.7 minutes, as is the standard deviation. Suppose that you observe a sample of 10 interarrival times. a. Theoretically, what are the mean and standard deviation of all possible sample means? b. Use the technology of your choice to simulate 1000 samples of 10 interarrival times each. c. Determine the mean of each of the 1000 samples you obtained in part (b). d. Roughly what would you expect the mean and standard deviation of the 1000 sample means you obtained in part (c) to be? Explain your answers. e. Determine the mean and standard deviation of the 1000 sample means you obtained in part (c). f. Compare your answers in parts (d) and (e). Why are they different?
Suppose a sample of O-rings was obtained and the wall thickness (in inches) of each was recorded. Use a normal probability plot to assess whether the sample data could have come from a population that is normally distributed.. Click here to view the table of critical values for normal probability plots Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. 0.180 0.188 0.192 0.199 0.213 0.218 0.227 0.240 0.264 0.266 0.287 0.288 0.303 0.304 0.317 0.308 Using the correlation coefficient of the normal probability plot, is it reasonable to conclude that the population is normally distributed? Select the correct choice below and fill in the answer boxes within your choice. (Round to three decimal places as needed.) OA. Yes. The correlation between the expected z-scores and the observed data, data come from a normal population. OB. No. The correlation between the expected z-scores and the observed data, that…
A company selling a new type of laptop battery advertises that it has a méan lifetime of 5 years. If you were in charge of quality control at the factory, which one of the following standard deviations of battery life spans would you prefer? 2 months. O 2 years O 5 years 27
20
Assume that the traffic to the web site of Smiley's People, Inc., which sells customized T-shirts, follows a normal distribution, with a mean of 6.5 million visitors per day and a standard deviation of 3 million visitors per day. What is the probability that the web site has more than 1.5 million visitors in a single day? Question 3 options: 0.7545 0.5543 0.9522 0.3454
Answer these question
Assuming that a population is normally distributed, then about 75% of sample means drawn from this population will lie within how many standard deviations of the population mean? 1 Multiple Choice eBook 1.15 2.575 1.645 1.5 O
Which statement is true of α (alpha)? A. As α decreases, the chance of making a Type 1 error increases. B. Alpha increases as our sample size decreases. C. Conventionally, social researchers set α = .05 D. Lower levels of α can provide absolute certainty of our statistical decisions.
If P(Z>z1)=0.10 in the standard normal distribution, which of the following is the nearest value for z1? Please select one: a. 2.29 b. 1.96 c. 1.10 d. 1.28 e. 1.64