An invistigator wants to estimate caffeineconsumption in high school students. How many students would berequired to estimate the proportion of students who consume coffee?Suppose we want the estimate to be within 5 persent points of the trueproportion with 95% confidence. (Hint: for any p value, 0

MOE ≤ 5% = 0.05 Required n= no of students

Answered: An invistigator wants to estimate…

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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A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size sample should be obtained if he wishes the estimate to be within4 percentage points with 95% confidence if (a) he uses a previous estimate of 34%? (b) he does not use any prior estimates?
You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 33%. You would like to be 90% confident that your estimate is within 1% of the true population proportion. How large of a sample size is required? Hint: Video [+] n =
Andy Roddick, a former professional tennis player believes he can make 70% of his first serves that are at least 110 mph. His friends believe the percentage should be smaller than 70%. They challenged Andy to do 400 first-serves. Andy successfully served 260 times. The null hypothesis is that he can serve 70% of his first serves. The observed percentage is [A]%. Find the standard error for percentage. Hint: The SD for the box model is The standard error for percentage is [B]%. Round your answer to the nearest tenth of a percent(for example 6.3%) The z-statistic is [C]. Round your answer to two decimal places. The p-value is [D]%. Round your answer to the nearest tenth of a percent(for example 6.3%) If the significance level is set at 5%, do you reject the null hypothesis? Write yes or no. [E] If the significance level is set at 1%, do you reject the null hypothesis? Write yes or no. [F]
A random sample of medical files is used to estimate the proportion p of all people who haveblood type B. If you have no preliminary estimate for p, how many medical files should youinclude in a random sample in order to be 99% sure that the point estimate will be within adistance of 0.04 from p? Group of answer choices 4,161 33 17 2081 1,041
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A drug company claims that their products’ contaminations never vary by more than 2%. Sample of 5 specimens were tested and the percentages of the purities are recorded as Observation no. 1 2 3 4 5 Percentages (%) 98.8 97.2 98.9 97.7 97.9 a. Do the sample data have enough proof to oppose the manufacturer's claim? (HINT: take the range of 2% equal 4o.) b. Find a 90% confidence interval for o?.
A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size sample should be obtained if he wishes the estimate to be within 55 percentage points with 90% confidence if (a) he uses a previous estimate of 28%? n=what (b) he does not use any prior estimates? n=what
8 In interval estimation of a population parameter, increasing α would: a increase the margin of sampling error, and make the interval estimate more precise. b reduce the margin of sampling error, and reduce the error probability. c reduce the margin of sampling error, and reduce the confidence level. d reduce the margin of sampling error, and make the interval estimate less precise.
Refer to the accompanying data display that results from a sample of airport data speeds in Mbps. Complete parts (a) through (c) below. TInterval (13.046,22.15) X = 17.598 Sx = 16.01712719 n = 50 Click the icon to view a t distribution table. a. What is the number of degrees of freedom that should be used for finding the critical value t12? df = (Type a whole number.) b. Find the critical value t/2 corresponding to a 95% confidence level. ta12 = %3D (Round to two decimal places as needed.) c. Give a brief general description of the number of degrees of freedom. A. The number of degrees of freedom for a collection of sample data is the total number of sample values. B. The number of degrees of freedom for a collection of sample data is the number of sample values that can vary after certain restrictions have been imposed on all data values. C. The number of degrees of freedom for a collection of sample data is the number of sample values that are determined after certain restrictions…
The proportion of people that own cats is 80%. A veterinarian believes that this proportion is significantly different than 80% and surveys 500 people. Test the veterinarian's claim at the a = 0.05 significance level. Preliminary: a. Is it safe to assume that n ≤ 0.05 of all subjects in the population? No Yes b. Verify np(1 - p) ≥ 10. Round your answer to one decimal place. np(1 - p) Test the claim: a. The null and alternative hypotheses are O H : }=0.8 Haμ0.8 Ho p≤0.8 Ha p > 0.8 . Ho: p=0.8 Ha: p 0.8 Ο Η : μ 0.8 Η : μ Σ 0.8 Ha : μ < 0.8 Ho: p=0.8 Ha p < 0.8 b. The test is Select an answer c. Based on the sample of 500 people, 75% owned cats. Calculate the test statistic. Round to two decimal places. x = d. Calculate the p-value. Round to four decimal places. e. Make a decision. Fail to reject the null hypothesis Reject the null hypothesis f. Make a conclusion. There is not sufficient evidence that the proportion of people who own cats is significantly different. There is sufficient…
Suppose you want to test the mean of quiz scores H0 : ? ≥ 72 versus H1 : ? < 72. Which of the following possible results based on a sample of size 25 from a normal population gives the strongest evidence to reject H0 in favor of H1? a. X̅ = 69, S = 5 b. X̅ = 68, S = 6 c. X̅ = 70, S = 4 d. X̅ = 67, S = 8
Using the following scenario, calculate the value of the point estimate. What proportion of students are willing to report cheating by other students? A student project put this question to an SRS of 229 undergraduates at a large university: "You witness two students cheating on a quiz. Do you go to the professor?" Only 25 answered "yes". Round your answer to two decimal places.

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