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Ashley Figueroa

Ashley F.

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Viewed Questions

Find the sample size needed to estimate the percentage of adults who have consulted fortune tellers. Use a 0.03 margin of error, use a confidence level of 98%, and use results from a prior Pew Research Center poll suggesting that 15% of adults have consulted fortune tellers.

Find the sample size needed to estimate the percentage of adults who have consulted fortune tellers. Use a 0.03 margin of error, use a confidence level of 98%, and use results from a prior Pew Research Center poll suggesting that 15% of adults have consulted fortune tellers.

Elementary Statistics

Estimates and Sample Sizes

Estimating a Population Proportion

Find the indicated critical value $z_{\alpha / 2}$. Find $z_{\alpha / 2}$ for $\alpha=0.20$.

Find the indicated critical value $z_{\alpha / 2}$. Find $z_{\alpha / 2}$ for $\alpha=0.20$.

Elementary Statistics

Estimates and Sample Sizes

Estimating a Population Mean: $\sigma$…
Find the critical value $z_{a / 2}$ that corresponds to the given confidence level. $$99 \%$$

Find the critical value $z_{a / 2}$ that corresponds to the given confidence level. $$99 \%$$

Elementary Statistics

Estimating Parameters and Determining…

Estimating a Population Proportion

In a Harris poll of 514 human resource professionals, 90% said that the appearance of a job applicant is most important for a good first impression. a. Among the 514 human resource professionals who were surveyed, how many of them said that the appearance of a job applicant is most important for a good first impression? b. Construct a 99% confidence interval estimate of the proportion of all human resource professionals believing that the appearance of a job applicant is most important for a good first impression. c. Repeat part (b) using a confidence level of 80%. d. Compare the confidence intervals from parts (b) and (c) and identify the interval that is wider. Why is it wider?

In a Harris poll of 514 human resource professionals, 90% said that the appearance of a job applicant is most important for a good first impression. a. Among the 514 human resource professionals who were surveyed, how many of them said that the appearance of a job applicant is most important for a good first impression? b. Construct a 99% confidence interval estimate of the proportion of all human resource professionals believing that the appearance of a job applicant is most important for a good first impression. c. Repeat part (b) using a confidence level of 80%. d. Compare the confidence intervals from parts (b) and (c) and identify the interval that is wider. Why is it wider?

Elementary Statistics

Estimates and Sample Sizes

Estimating a Population Proportion

Questions asked

ANSWERED

Aishwarya Krishnakumar verified

Numerade educator

Based on the data shown below, calculate the regression line (each value to at least two decimal places) y = x + x y 5 14.2 6 15.8 7 11.5 8 10.1 9 7.9 10 6.4

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ANSWERED

Jason Horton verified

Numerade educator

You run a regression analysis on a bivariate set of data ( n = 89 ). With x ¯ = 48.6 and y ¯ = 76.3 , you obtain the regression equation y = - 3.417 x + 242.366 with a correlation coefficient of r = - 0.158 . You want to predict what value (on average) for the response variable will be obtained from a value of x = 80 as the explanatory variable. What is the predicted response value?

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ANSWERED

Aishwarya Krishnakumar verified

Numerade educator

You run a regression analysis on a bivariate set of data ( n = 89 ). With x ¯ = 48.6 and y ¯ = 76.3 , you obtain the regression equation y = - 3.417 x + 242.366 with a correlation coefficient of r = - 0.158 . You want to predict what value (on average) for the response variable will be obtained from a value of x = 80 as the explanatory variable. What is the predicted response value?

View Answer
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