Score: 9.75/16 10/16 answeredescQuestion 12<>A population has mean = 11.1 and σ = 49.9. You intend to draw a random sample of size n = 60.(a) What is the shape of the sampling distribution of means?O left-skewedO bimodalO normalO right-skewedO uniform(b) What is the center of the sampling distribution of means?IRound to four decimal places as needed.(c) What is the standard error of the sampling distribution of means?σ =Round to four decimal places as needed.Check Answer기2->># 3C$74%&57

The objective of this question is to determine the shape, center, and standard error of the sampling…

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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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HW Score: 0%, O of 16 pts Question Help O The price-earnings ratios for all companies whose shares are traded on a specific stock exchange followa normal distribution with a standard deviston of 43 Arandom sample of these companies is selected in order to estimate the population mean price-earnings ratio Complete parts (a) through (c) a How large a sample is necessary in order to ensure that the probablity that the sample mean differs from the population mean by more than 1.1s less than 0 107 The sample size must be at least 42. (Type a whole number) b. Without doing the calculations, state whether a larger or smaller sample size compared to the sample sze in part (a) wouid be requred to guaranlee that the probability of the sample mean differing from the population mean by more than 1.1 is less than 0.05 Incorrect: O The sample size would need to be
Assume the samples are random and independent, the populations are nomally distributed, and the population variances are equal. The table available below shows the prices (in dollars) for a sample of automobile batteries. The prices are classified according to battery type. At a = 0.10, is there enough evidence conclude that at least one mean battery price is different from the others? Complete parts (a) through (e) below. E Click the icon to view the battery cost data. (a) Let u1. P2. H3 represent the mean prices for the group size 35, 65, and 24/24F respectively. Identify the claim and state Ho and H. H Cost of batteries by type The claim is the V hypothesis. Group size 35 Group size 65 Group size 24/24F 101 111 121 124 D 146 173 182 278 124 140 141 89 (b) Find the critical value, Fo, and identify the rejection region. 90 79 84 The rejection region is F Fo, where Fo = (Round to two decimal places as needed.) (c) Find the test statistic F. Print Done F= (Round to two decimal places as…
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Downs and Abwender (2002) evaluated soccer players and swimmers to determine whether routine blows to the head experienced by soccer players produced long term neurological deficits. In the study, neurological tests were administered to mature soccer players and swimmers. In a similar study, a researcher obtained the following data: Swimmers N₁ = 8 X₁ = 9 SS₁ = 68 Soccer players N₂ = 5 X₂ = 6 SS₂ = 31 (a) Compute a 95% confidence interval for μ₁ - µ2, the population mean difference in neurological scores between the two groups. (b) Compute an appropriate effect size (e.g., Cohen's d) to describe the mean difference in neurological scores between the two groups. (c) Perform a hypothesis test to decide whether the population mean neurological score for swimmers is significantly different from that of soccer players.
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Distribution of sample means e.
STRATIFIED Random Sampling 1. Below is the number of students taking up statistics from each department. A seminar will be conducted outside the campus: Table 1: Number of Students enrolled in Statistics Course Number of Percent (c) (d) students (0.0000) (whole no.) (whole no.) Nursing 1,120 HRM 589 Engineering 557 IT 434 Total 2,700 a. Which between the 3% and the 5% margin of error will allow the department to work within the budget? Justify your answer. b. At 5% margin of error, how many participants should be taken as samples? c. Using proportional allocation, how many participants will be taken from each department (refer to n in "b")? d. Using equal allocation, how many participants will be taken from each department (refer to n in "b")?
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Statistics students believe that the mean score on the first statistics test is 65. Astatistics instructor thinks the mean score is lower than 65. He randomly samples 10statistics student scores and obtains the scores [62, 54, 64, 58, 70, 67, 63, 59, 69, 64].He performs a hypothesis test using a 5% level of significance. Draw the graph of thenormal distribution showing the rejection region & indicate your calculated value. Statethe null and alternative hypothesis.

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