poll, 74% of California adults (374 out of 506 surveyed) believe that education is one of the top issues facing California. We want to construct a 90% confidence interval for the true proportion of California adults who believe that education is o

Many people now turn to the internet to get information on health-related topics. A research article used Flesch reading ease scores (a measure of reading difficulty based on factors such as sentence length and number of syllables in the words used) to score pages on Wikipedia and on WebMD. Higher Flesch scores correspond to more difficult reading levels. The paper reported that for a representative sample of health-related pages on Wikipedia, the mean Flesch score was 26.3 and the standard deviation of the Flesch scores was 14.3. For a representative sample of pages from WebMD, the mean score was 43.3 and the standard deviation was 19.6. Suppose that these means and standard deviations were based on samples of 40 pages from each site. Is there convincing evidence that the mean reading level for health-related pages differs for Wikipedia and WebMD? Test the relevant hypotheses using a significance level of 0.05. (Use ₁ for Wikipedia and #₂ for WebMD.) State the appropriate null and…

The figure to the right shows the results of a survey in which 2500 college graduates from the year 2016 were asked questions about employment. Construct 95% confidence intervals for the population proportion of college students who gave each response.

Many people now turn to the internet to get information on health-related topics. A research article used Flesch reading ease scores (a measure of reading difficulty based on factors such as sentence length and number of syllables in the words used) to score pages on Wikipedia and on WebMD. Higher Flesch scores correspond to more difficult reading levels. The paper reported that for a representative sample of health-related pages on Wikipedia, the mean Flesch score was 26.9 and the standard deviation of the Flesch scores was 14.9. For a representative sample of pages from WebMD, the mean score was 43.5 and the standard deviation was 19.2. Suppose that these means and standard deviations were based on samples of 40 pages from each site. Is there convincing evidence that the mean reading level for health-related pages differs for Wikipedia and WebMD? Test the relevant hypotheses using a significance level of 0.05. (Use μ₁ for Wikipedia and μ₂ for WebMD.) USE SALT State the appropriate…

The report of a sample survey of 1,014 adults says, "With 95% confidence, the true population proportion of all Americans that expect to spend more money on gifts this year than last year is between 0.09 and 0.15." What does the phrase "95% confidence" mean?

Consider the following data: - 4 - 3 - 1 P(X = x) 0.2 0.1 0.2 0.1 0.4 Step 4 of 5: Find the value of P(X > -2). Round your answer to one decimal place.

If 64% of a sample of 550 people leaving a shopping mall claims to have spent over $25 create and interpret a 95% confidence interval estimate for the proportion of shopping mall customers who spend over $25

You're considering going to graduate school, and you would like to know how many people would recommend it. You talk to 28 people, and 6 recommend it. Construct a 96% confidence interval for p, the proportion of people that recommend you go to graduate school. What is the lower bound of this interval?

The figure to the right shows the results of a survey in which 997 adults from Country​ A, 1022 adults from Country​ B, 1013 adults from Country​ C, 1011 adults from Country​ D, and 1008 adults from Country E were asked whether national identity is strongly tied to birthplace. Construct a 95​%confidence interval for the population proportion of adults who say national identity is strongly tied to birthplace for each country listed.   The 95​% confidence interval for the proportion of adults from Country A who say national identity is strongly tied to birthplace is ,. ​(Round to three decimal places as​ needed.)   Country A   37%             Country B    18%  Country C      27%  Country  D     46% Country  E  11 ​%

What Z score would be used to construct a 90% confidence level? Is it ... a. 1.65 b. 2.33 c. 2.58 d. 1.96