Tests the claim that 41 p2. Assume the samples are random and independent.0.68; 02=0.6744.34 ; 72 = 44.45%3Dn1 = 34 ; n2 = 37Standard ErrorZ-Test Statistic(21 – 32) – (H1 – 2)2%3Dn1n2a. Calculate the Standard Error oz- =(3 decimal places)b. Calculate the Z-test statistic using the standard error from part a. : =(2 decimal places)C. At a = 0.06 , Use the distribution table to find the critical values for the rejection regione = ±(3 decimal places)conclusion?

Solution: State the hypotheses. Null hypothesis: H0: µ1= µ2 Alternative hypothesis: H1: µ1≠ µ2 From…

Answered: Tests the claim that 41 # p2. Assume…

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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Use the Suppose in a local Kindergarten through 12th grade (K -12) school district, 42% of the population favor a charter school for grades K through 5. A simple random sample of 144 is surveyed. nd the mean and the standard deviation of X of B(144, 0.42). Round off to 4 decimal places. b. Now approximate X of B(144, 0.42) using the normal approximation with the random variable Y and the table. Round off to 4 decimal places. Y N( C Find the probability that at most 72 favor a charter school using the normal approximation and the table. Round off to z-values up to 2 decimal places.) P(X 68) P(Y > ~ (Z >) e. Find the probability that exactly 63 favor a charter school using the normal approximation and the table. (Round off to z-values up to 2 decimal places.) P(X = 63) P(
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CALL CENTERExcopt for PANAMA) 1-800-SAMSUNG (1-800-726-75 6. For a population with a mean of u = 100 and a standard deviation of o = 20, a. Find the z-score for each of the following X values. X = 108 X = 115 X = 130 %3D %3D %3D X = 90 b. Find the score (X value) that corresponds to each of the following z-scores. X = 88 X = 95 z = -0.40 z = -0.50 z = 1.80 z = 0.75 Z = 1.50 Z = -1.25
Executives of a supermarket chain are interested in the amount of time that customers spend in the stores during shopping trips. The executives hire a statistical consultant and ask her to determine the mean shopping time, u, of customers at the supermarkets. The consultant will collect a random sample of shopping times at the supermarkets and use the mean of these shopping times to estimate u. Assuming that the standard deviation of the population of shopping times at the supermarkets is 27 minutes, what is the minimum sample size she must collect in order for her to be 99% confident that her estimate is within 5 minutes of u? Carry your intermediate computations to at least three decimal places. Write your answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements). (If necessary, consult a list of formulas.) ?
6
This output represents the hypothesis test that the average age at first pregnancy of women diagnosed with breast cancer is different depending on whether or not metastases are present (yes or no) at the time of breast cancer diagnosis.
The cross-tabulation data given below represent the number of males and females in a work group who feel overstressed and those who don't. Complete parts a through d below. Overstressed? Female Male No Yes 10 6 5 11 a. Write the hypotheses for the chi-square test for independence. Ho gender and overstress are independent H₁ gender and overstress are dependent b. Find the expected frequencies. Overstressed? Female Male Grand Total No 7.5 7.5 15 Yes 8.5 8.5 17 Grand Total 16 16 32 (Type integers or decimals rounded to two decimal places as needed.) c. Compute the chi-square statistic 3.14 (Type an integer or decimal rounded to two decimal places as needed.) d. Find the chi-square critical value and p-value and draw a conclusion using a level of significance of 0.05. Find the chi-square critical value (Round to three decimal places as needed.) ad
Tests the claim that 1 # p2. Assume the samples are normally distributed, random and independent. of + o S1 =0.77 ; s2 = 0.82 E1 = 48.92 ; z2 = 48.94 n1 = 24; n2 = 31 a. Calculate the Standard Error s-, = (use 3 decimal places) (use 2 decimal places) b. Calculate the t-test statistic using the standard error from part a. t = c. What are the degrees of freedom? df %3! d. At a = 0.02, Use the distribution table to find the critical values for the rejection region t = ± (use 4 decimal places) e. What is your conclusion? O Fail to reject the null hypothesis and do not support the claim O Reject the alternative hypothesis and support the claim O Accept the null hypothesis and support the claim O Reject the null hypothesis and support the claim O Accept the alternative hypothesis and reject the claim
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Number 5
Heart rates are determined before and 30 minutes after a Kettleball workout. It can be assumed that heart rates (bpm) are normally distributed. Use the data provided below to test to determine if average heart rates prior to the workout are significantly lower than 30 minutes after a Kettleball workout at the 0.02 level of significance. Let u1 = mean before workout. before 61 75 60 61 70 73 68 after 62 73 62 65 75 74 71 Select the correct Hypotheses: Ho: µd µ2 Ho:µ1 = 0 Ho:µ1 0 Ha: µ1 µ2 = µ2 Ho: µd 20 Ho: µld Test Statistic %3D [three decimal accuracy] p-value = [three decimal accuracy] Conclusion: O Fail to Reject Ho O Reject Ho

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