You want to know the percentage of the time that people prefer one political candidate over another. Youconduct a survey and find that 69 out of 100 people polled indicate such a preference.Next week, we will construct (compute) a confidence interval for the true population parameter. This week, wewant to understand all the moving parts.Where applicable, round your answers to three decimal places.(a) Is this a confidence interval for a population proportion or a population mean?proportionmean(b) Explain how you can tell your answer to (a)(c) What is the sample size n?(d) What is the point estimate (as a decimal)?(e) Is the point estimate a sample proportion or a sample mean?O sample proportion psample mean(f) The 90% confidence interval is 0.614 < p < 0.766. Write this Cl as a point estimate +/- the margin of error:+ (g) Finally, write a careful sentence that explains what this confidence interval tells us about the preference forthis particular political candidate:

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Answered: (a) Is this a confidence interval for a…

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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Question: In a class of 50 students, the scores on a statistics exam are as follows: 10 students scored 80, 15 students scored 70, 20 students scored 60, and the rest scored 50. What is the mean score on the exam?
The grade point averages (GPA) for 12 randomly selected college students are shown on the right. Complete parts (a) through (c) 2.3 3.4 2.6 D below. 1.6 0.9 4.0 Assume the population is normally distributed. 2.3 1.1 3.8 0.2 2.2 3.4 (a) Find the sample mean. X = (Round to two decimal places as needed.) (b) Find the sample standard deviation. S = (Round to two decimal places as needed.) (c) Construct a 99% confidence interval for the population mean u. A 99% confidence interval for the population mean is (Round to two decimal places as needed.)
You are testing the claim that the mean GPA of night students is different from the mean GPA of day students. A sample of 24 night students and 28 day students and their GPA's are recorded below. Test the claim using a 1% level of significance. Assume the population variances are unequal and that GPAs are normally distributed. Give answers to 4 decimal places. GPA-Night GPA-Day 3.05 3.38 2.91 3.02 3.27 3.4 3.29 2.73 3.3 3.24 3.35 2.69 3.39 3.25 3.52 3.33 3.39 2.33 3.25 3.51 3.08 3.07 3.27 2.9 3.32 3.48 3 2.94 3.62 2.93 3.64 3.31 3.54 2.62 3.45 2.66 3.29 3.27 3.56 2.76 3.15 2.7 3.4 3.27 3.51 2.96 3.54 2.86 3.24 2.72 2.64 3.14 What are the correct hypotheses? Note this may view better in full screen mode. Select the correct symbols in the order they appear in the problem.H0: Select an answer x̅₂ s² x̅₁ σ² μ₂ μ₁ p ? = ≠ > < ≥ ≤ Select an answer 0 μ₂ x̅₂ x̅₁ σ² p s² μ₁ H1: Select an answer σ² x̅₂ x̅₁ μ₁ μ₂…
Which of the following is TRUE about the mean of the sampling distribution of the sample means? It is less than the population mean. It is not related to the population mean. It is equal to the population mean. It is greater than the population mean.
You are testing the claim that the proportion of men who own cats is smaller than the proportion of women who own cats.You sample 190 men, and 71 own cats.You sample 130 women, and 114 own cats.Find the test statistic, rounded to two decimal places
Question: Can you give an example of variable for which the mean would not be appropriate to describe the data (that is, tell me a circumstance in which you would not want to use the mean to describe a dataset).
(a) Find the standard error of the mean for each sampling situation (assuming a normal population). (Round your answers to 2 decimal places.) Standard Error (a) o = 26, n = 4 (b) o = 26, n = 16 (c) o = 26, n = 64 (b) What happens to the standard error each time you quadruple the sample size? The standard error is (reduced O by half.
Sample data were collected in a study of calcium supplements and their effects on blood pressure. A placebo group and a calcium group began the study with measures of blood pressures for each group. What test would be most appropriate, if you have non-normal data? Name of Test _____________________________________________
You were interested in how long the average psychology major at your college studies per night, so you asked 10 psychology majors to tell you the amount they study. They told you the following times: 2, 1.5, 3, 2, 3.5, 1, 0.5, 3, 2, 4. (a) Find the 95% confidence interval on the population mean. (b) Find the 90% confidence interval on the population mean.
(a) Find the standard error of the mean for each sampling situation (assuming a normal population). (Round your answers to 2 decimal places.) Standard Error (a) o = 20, n = 25 %3D (b) o = 20, n = 100 %3D (c) 0 = 20, n = 400 %3D (b) What happens to the standard error each time you quadruple the sample size? The standard error is (Click to select) v by half. nces on MacBook All
(a ) Calculate the mean of the distribution . (b ) Calculate the 10% trimmed mean . ( c) Why is the trimmed mean a better summary of the center of this distribution than the mean?
In each situation, find the value of the standardized statistic for the sample mean, and indicate whether the standardized statistic is a t-statistic or a z-statistic. (Round your answer for part (a) to three decimal places.) (a) x = 195, u= 190, s = 21, n = 4 standardized statistic = it's t because s is used instead of o v (b) x = 195,H= 190, o = 25, n = 4 standardized statistic = it's z because o is known (c) x = 168,H= 190, s = 22, n = 25 standardized statistic = : it's t because s is used instead of o

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(a) Is this a confidence interval for a population proportion or a population mean? proportion mean (b) Explain how you can tell your answer to (a) (c) What is the sample size n?