Which of the following decreases the margin of error for a confidence interval? Decreasing the sample size. Decreasing the confidence level. Increasing the sample size. Increasing the confidence level.
Q: 1a What is a confidence interval? 1b How does a confidence interval differ from a point estimate?
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Q: How do you interpret the confidence interval. Select all that apply. We are 95% confident that the…
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A: Here use confidence interval formula
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A: given data N =3500n = 280x = 56claim : p = 0.30
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Q: We wish to estimate what percent of adult residents in Ventura County like chocolate. Out of 300…
A: Givensample size(n)=300x=270confidence level=90%
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- Help. How do you find the solution. Where do you start?Virginia wants to estimate the percentage of students who live more than three miles from the school. She wants to create a 95% confidence interval which has a margin of error of at most 5%. How many students should be polled to create the confidence interval? z0.10 z0.05 z0.025 z0.01 z0.005 1.282 1.645 1.960 2.326 2.576 Use the table of values above.Library A food safety guideline is that the mercury in fish should be below 1 part per million (ppm). Listed below are the amounts of mercury (ppm) found in tuna sushi sampled at different stores in a major city. Construct a 90% confidence interval estimate of the mean amount of mercury in the population. Does it appear that there is too much mercury in tuna sushi? 0.58 0.74 0.10 0.92 1.32 0.49 0.96 t: 0 What is the confidence interval estimate of the population mean p? ppmDrug Tests There is a 3.9% rate of positive drug test results among workers in the United States (based on data from Quest Diagnostics). Assuming that this statistic is based on a sample of size 2000, construct a 95% confidence interval estimate of the percentage of positive drug test results. Write a brief statement that interprets the confidence interval.find an explain a study that uses confidence intervals. Share and explain what the study was about and how they use confidence intervals in the study to estimate the population parameter.We wish to estimate what percent of adult residents in Ventura County like chocolate. Out of 500 adult residents sampled, 429 like chocolate. To construct a 99% confidence interval for the proportion (p) of adult residents who like chocolate in Ventura County, you need to use which one of the following calculator? Hypothesis Test for a Population Proportion Confidence Interval for a Population Mean Given Data Confidence Interval for a Population Mean Given Statistics Chi-Square Test for Independence Hypothesis Test for a Population Mean Given Data Two Dependent Sample Means Comparison Given Data Confidence Interval for a Population Proportion Hypothesis Test for a Population Mean Given Statistics One-Way ANOVA Two Independent Sample Means Comparison Given Statistics Two Independent Sample Means Comparison Given Data Two Independent Proportions Comparison Chi-Square Test for Goodness of Fit Enter your answer as an open-interval (i.e., parentheses) using decimals (not percents)…Assistance with HomeworkYou are interested in finding a 90% confidence interval for the average number of days of class that college students miss each year. The data below show the number of missed days for 13 randomly selected college students. Round answers to 3 decimal places where possible. 7 8 8 0 2 11 6 10 2 0 1 3 1 With 90% confidence the population mean number of days of class that college students miss is between and days.PLEASE ELABORATE MORE The data set below shows the amount of trash generated by ten households (in pounds per day). Assume that the population is normally distributed. 3:9 4:6 15:6 10:5 16:0 6:7 12:0 9:2 13:8 16:8 (a) Construct a 95% confidence interval for the mean based on the sample. (b) Construct a 90% confidence interval for the mean. (c) Construct an 80% confidence interval for the mean.Person1 Person2 Person3 Person4 Person5 Person6 Person7 Person8 Person9 Height 72 70 70 72 71 76 74 74 69 Shoe Size 11 10 10 12 10 15 14 13 11 * Confidence level is 95% * find the mean and standard deviation for height * find the mean and standard deviation for shoe size * Construct and interpret a confidence interval to estimate the mean height of the population. write the formula for the confidence interval then substitute the numbers. * Construct and interpret a confidence interval to estimate the mean shoe size of the population. write the formula for the confidence interval then substitute the numbers.If you increase the confidence level, the confidence interval ________________. A.stays the same B.decreases C.may increase or decrease, depending on the sample data D.increases