1. Indicate whether each the following statements is true or false. Correct thefalse statement.a. A point estimate is a range of values used to estimate a population parameter(......).b. The critical values z and t if n =17 and the confidence level is 98% are2.17and 2.5669, respectively (......).c. The suggested formula for e in the following confidence interval estimate(pe,p+e)where p represents a sample proportion is e =p(1-p)n(......).

Answered: 1. Indicate whether each the following…

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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1 The results below are based on a sample of 20 employees selected to study the relationship between income (Y, in $1,000) and four variables: Age (X1, in years), work experience (X2,in years), number of years of education (X3), and number of past jobs (X4). Find the lower end point in a 90% confidence interval for the change in the mean salary in dollars, for a unit change in number of past jobs, assuming that the other predictors remain unchanged. Note that normality is assumed for the multiple regression model. Standard Coeffcient Error Intercept-9.611198 2.77988638 Age 1.327695 0.1149193 Experience -0.106705 0.14265559 7.311332 0,80324187 Educ PastJobs -0.504168 0.44771573 Type your numerical answer here. Numbera only
Let μ denote some population mean of interest and suppose a 95% confidence interval for μ is calculated to be (0.63, 0.73) and a 99% confidence interval for μ is calculated to be (0.61,0.75). Also, suppose that we want to test H0: μ = 0.77 vs. Ha: μ ≠ 0.77 What can you say about the corresponding p-value? Choose from following letters. a. The corresponding p-value will be smaller than 0.05 but larger than 0.01. b. The corresponding p-value will be larger than 0.05. c. the corresponding p-value will be smaller than 0.01. d. I can’t say anything about the corresponding p-value until I run the test
0 9 10 10 10 4 12 7 11 5 0 8 3 a. To compute the confidence interval use a ? t z distribution. b. With 90% confidence the population meannumber of days of class that college students miss is between and days. c. If many groups of 13 randomly selected non-residential college students are surveyed, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population mean number of missed class days and about percent will not contain the true population mean number of missed class days.
...
Find the value:
6. a. fine the margin of error for the given values of c, s and n c=0.98, s=6, n=9 b. Find the margin of error for the given values of c, s and n. c=0.98, s=2.8, n=25 c. construct the indicated confidence interval for the population mean u using the t-distribution. Assume the population is normally distributed. c=0.99, x=14.5,s=3.0,n=9 d. construct the indicated confidence interval for the population mean u using the t-distribution. Assume the population is normally distributed. c=0.99, x=14.4, s=0.66, n=15
We provide a sample mean, sample size, sample standard deviation, and confidence level. a. use the one-mean t-interval procedure to find a confidence interval for the mean of the population from which the sample was drawn. b. obtain the margin of error by taking half the length of the confidence interval. c. obtain the margin of error by using the formula tα/2•s/√n. x = 30, n = 25, s = 4, confidence level = 90%
The width of a confidence interval for a proportion will be:a. wider for a sample of size 100 than for a sample of size 50b. wider for 90% confidence than for 95% confidencec. narrower for 99% confidence than for 95% confidenced. wider when the sample proportion is 0.50 than when the sample proportion is 0.20 Calculations:
At a charter high school, the average GPA of a high school senior is known to be normally distributed. After a sample of 27 seniors is taken, the average GPA is found to be 2.85 and the sample variance is determined to be 0.16. Find a 95% confidence interval for the population mean GPA. a. 2.5615 to 2.8585 b. 2.6358 to 3.0642 c. 2.6917 to 3.0083 d. 2.5167 to 2.9033
14. The sales price of a specific brand of cereal is believed to be normally distributed. Data were collected for a sample of 16 boxes of that brand of cereal. If the sample mean is 2 OMR and the sample standard deviation is 0.4 OMRthen the 90% confidence interval for the population mean is A. (1.8355 , 2.1645) B. (1.8040 , 2.1960) C. None D. (1.8247 , 2.1753)
OT J0 For what type of variable does it make sense to construct a confidence interval about a population proportion? Choose the correct answer below. O.A. Qualitative with 3 or more possible outcomes OB. Discrete C. Continuous D. Qualitative with 2 possible outcomes E. Quantitative O F. Any variable Click to select your answer. O O O O

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