Assume that the sample is a simple random sample obtained from a normally distributed population of flight delays at an airport. Use the table below to find theminimum sample size needed to be 95% confident that the sample standard deviation is within 1% of the population standard deviation. A histogram of a sample ofthose arrival delays suggests that the distribution is skewed, not normal. How does the distribution affect the sample size?To be 95% confident that s iswithinof the value of 6, the sample sizen should be at leastTo be 99% confident that s iswithinof the value of o, the sample sizen should be at least1% 5% 10% 20% 30% 40% 50%19,205 768 19248211% 5% 10% 20% 30% 40% 50%33,218 1,336 336853814

Answered: Assume that the sample is a simple…

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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The mean is 146 and the standard deviation is 35. A score of 41 is how many z-scores below the mean?
I'd like the first question answer, the one that fills in the boxes. I can do the rest
Please answer within 30min thanks.
Use z-scores to make the following comparison. A high school student took two college entrance exams, scoring 1110 on the SAT and 27 on the ACT. Suppose that SAT scores have a mean of 950 and a standard deviation of 130 while the ACT scores have a mean of 22 and a standard deviation of 4. Assuming the performance on both tests follows a normal distribution, determine which test the student did better on.
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This assignment is worth 1 points. The extra point will be added to your overall course grade. For example: if you receive an 88% in the course you can receive up to 1 point giving you a new score of 89%. The following rubric will be used. 0.25 point for drawing the normal distribution curve with the mean value labeled on the curve and the appropriate area shaded. 0.25 point for determining the value of the standard deviation of the sample mean. 0.5 point for finding the correct probability. All work must be shown in order to receive any credit. Please upload your completed assignment here. The length of time taken on the SAT for a group of students is normally distributed with a mean of 2.5 hours and a standard deviation of 0.25 hours. A sample size of n = 60 is drawn randomly from the population. Find the probability that the sample mean is between two hours and three hours.
Answer number 3 only pls.
3.3
A certain drug is used to treat asthma. In a clinical trial of the drug, 15 of 277 treated subjects experienced headaches (based on data from the manufacturer). The accompanying calculator display shows results from a test of the claim that less than 9% of treated subjects experienced headaches. Use the normal distribution as an approximation to the binomial distribution and assume a 0.01 significance level to complete parts (a) through (e) below. 1-PropZTest prop <0.09 z-- 2.084814472 p-0.0185430723 p-0.0541516245 n= 277 a. Is the test two-tailed, left-tailed, or right-tailed? Left-tailed test Two-tailed test O Right tailed test b. What is the test statistic? z= (Round to two decimal places as needed.) c. What is the P-value? P-value = (Round to four decimal places as needed.) d. What is the null hypothesis, and what do you conclude about it? Identify the null hypothesis. Click to select your answer(s). tv w MacBook Air esc 000 F1 F2 F3 000 F4 F5 F6 F7 F11 F8 F9 F10 @ 23 $ & 3 4 6 7 9…
The goal of the one-sample t-test is to: Group of answer choices describe the location of a score within a distribution compare the mean of a sample to the population mean. compare the means of two samples. compare the standard deviation of a sample to the standard deviation of the population.
If we meet these conditions, the sampling distribution of the mean will have a normal shape and ... The mean of the sampling distribution will be u, (i.e., the same as the population mean) and the standard deviation of the sampling distribution will be (that's the population standard deviation divided by the square root of the sample size). In the AP Stats Guy video, he talks about the number of text messages his students send during class. Suppose the average number of text messages his students send during class is u = 30 text messages. If we take samples of say, n = 36 students at a time, we would expect the mean of the sampling distribution we create to be the same as the population mean, 30 text messages. If we can further say that standard deviation of the number of text messages is 12 text messages, by how much would we expect the sample means to vary? (hint, use the formula above) text messages

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