Confidence Intervals. A Gallup Poll conducted from December 5 to 8, 2013, asked a random sample...

Confidence Intervals. A Gallup Poll conducted from December 5 to 8, 2013, asked a random sample of 1031 adults to rate the honesty and ethical standards of people in a variety of professions. Among the respondents, 406 rated the honesty and ethical standards of TV reporters as very high or high. Assume that the sample was an SRS.

A) Give a 95% confidence interval for the proportion of all adults who would rate the honesty and ethical standards of TV reporters as very high or high. Make sure you start your answer properly “we are 95% confident that …”

B) Give a 90% confidence interval.

Solutions

Expert Solution

orchestra answered 1 year ago

Next > < Previous

Related Solutions

The Gallup survey company conducted a poll in May 2011. Researchers asked a random sample of...

The Gallup survey company conducted a poll in May 2011. Researchers asked a random sample of about 1000 U.S. adults the following question: “From what you know or have read about raising the debt ceiling, would you want your member of Congress to vote in favor of, that is, for raising the debt ceiling, to vote against raising the debt ceiling, or do you not know enough about this issue to say?” Forty-eight percent of the adults who responded said...

The Gallup survey company conducted a poll in May 2011. Researchers asked a random sample of...

Confidence in banks: A poll conducted in 2012 asked a random sample of 1342 adults in...

Confidence in banks: A poll conducted in 2012 asked a random sample of 1342 adults in the United States how much confidence they had in banks and other financial institutions. A total of 143 adults said that they had a great deal of confidence. An economist claims that less than14% of U.S. adults have a great deal of confidence in banks. Can you conclude that the economist's claim is true? Use both =α0.10 and =α0.01 levels of significance and the...

1) The Gallup Poll asked a random sample of 1785 adults whether they attended church or...

1) The Gallup Poll asked a random sample of 1785 adults whether they attended church or synagogue during the past week. Of the respondents, 44% said they did attend. Suppose that 40% of the adult population actually went to church or synagogue last week. Let p^ be the proportion of people in the sample who attended church or synagogue. Find the probability of obtaining a sample of 1785 adults in which 44% or more say they attended church or synagogue...

A poll conducted in 2013 surveyed a random sample of 2003 American adults, and 18% of...

A poll conducted in 2013 surveyed a random sample of 2003 American adults, and 18% of them said that they have seen a ghost. Construct a 95% confidence interval for the proportion of American adults who have seen a ghost.

Assume a 2015 Gallup Poll asked a national random sample of 515 adult women to state...

Assume a 2015 Gallup Poll asked a national random sample of 515 adult women to state their current weight. Assume the mean weight in the sample was ?¯=155. We will treat these data as an SRS from a normally distributed population with standard deviation ?=33 pounds. Give a 99% confidence interval for the mean weight of adult women based on these data. Enter the upper and lower values of your confidence interval into the spaces provided rounded to two decimal...

The Gallup Poll once asked a random sample of 1600 adults “Do you happen to do...

The Gallup Poll once asked a random sample of 1600 adults “Do you happen to do step aerobics?” Suppose that in fact 26% of all Americans do step aerobics. a) What is the mean of the sampling distribution of proportions who do step aerobics? b) What is the standard deviation the sampling distribution of proportions who do step aerobics? c) Justify the distribution: HINT: Check that np and n(1-p) are greater than or equal to 10. d) What is the...

A Gallup poll asked a random sample of 1000 adults nation-wide the following question:: "Are you...

A Gallup poll asked a random sample of 1000 adults nation-wide the following question:: "Are you in favor of the death penalty for a person convicted of murder?" 71% of the people in the sample answered "Yes". 1. A 95% Confidence Interval for the percent of all adults nation-wide in favor of the death penalty is (Hint: Fill in the first blank with the sample % and the second with the margin of error.) （） % +/- （）%...

A poll conducted in 2012 asked a random sample of 1358 adults in the United States...

A poll conducted in 2012 asked a random sample of 1358 adults in the United States how much confidence they had in banks and other financial institutions. A total of 149 adults said that they had a great deal of confidence. An economist claims that less than 13% of U.S. adults have a great deal of confidence in banks. Can you conclude that the economist's claim is true? Use both α=0.10 and α=0.01 levels of significance and the P-value method...

a gallup poll conducted in 2012 asked people do you think the united states benefit from...

a gallup poll conducted in 2012 asked people do you think the united states benefit from having a clwss of rivh people. in reponse 80^

Subjects