Question

In: Statistics and Probability

Suppose 13% of surveyed respondents indicated that they drunk Kava. The sample consisted of 500 persons...

Suppose 13% of surveyed respondents indicated that they drunk Kava. The sample consisted of 500 persons in a simple random sample. a. What is the point estimation for 95% confidence interval? b. What is the margin error for 95% confidence interval? c. Construct a 99% confidence interval for the population proportion of subjects who drunk Kava. Interpret the 99% confidence interval

Solutions

Expert Solution


Related Solutions

A public opinion poll surveyed a simple random sample of 550 voters in Oregon. The respondents...
A public opinion poll surveyed a simple random sample of 550 voters in Oregon. The respondents were asked which political party they identified with most and were categorized by residence. Results are shown below. Decide if voting preference is independent from location of residence. Let α=0.05. Republican Democrat Independent NW Oregon 85 103 22 SW Oregon 45 66 10 Central Oregon 46 53 9 Eastern Oregon 67 33 11 Enter the test statistic - round to 4 decimal places.
Suppose that 6.5% of all persons are allergic to penicillin. A sample of 561 persons is...
Suppose that 6.5% of all persons are allergic to penicillin. A sample of 561 persons is selected. a. the probability that less than 8% of persons in the sample will be allergic to penicillin is approximately? b. the probability then 7.5% to 9% of persons in the sample will be allergic to penicillin is approximately?
A researcher has collected a sample of 25 respondents and the mean was calculated as 500....
A researcher has collected a sample of 25 respondents and the mean was calculated as 500. The sample was randomly drawn from a normal population whose standard deviation is 15. a) Estimate the population mean with 99% confidence b) Repeat the part (a) changing the population standard deviation to 30. c) Repeat the part (a) changing the population standard deviation to 60. d) Describe what happens to the confidence interval estimate when the standard deviation is increased.
. A sample of 500 respondents was selected in a large metropolitan area to study consumer...
. A sample of 500 respondents was selected in a large metropolitan area to study consumer behavior, with the following results shown through the contingency table: Gender Enjoy Shopping for Male Female Total Clothing Yes 136 224 360 No 104 36 140 Total 240 260 500 a. Find the probability of selecting a male respondent.                                 (2) b. What is the probability that selected respondent is a female who enjoys shopping for clothing?(2) c. What is the probability, if a person is...
A researcher has collected a sample of 25 respondents and the mean was calculated as 500....
A researcher has collected a sample of 25 respondents and the mean was calculated as 500. The sample was randomly drawn from a normal population whose standard deviation is 15. a) Estimate the population mean with 99% confidence b) Repeat the part (a) changing the population standard deviation to 30. c) Repeat the part (a) changing the population standard deviation to 60. d) Describe what happens to the confidence interval estimate when the standard deviation is increased.
A public opinion poll surveyed a simple random sample of 1000 voters. Respondents were classified by...
A public opinion poll surveyed a simple random sample of 1000 voters. Respondents were classified by gender (male or female) and by voting preference (Republican, Democrat, or Independent). Results are shown in the contingency table below.                                                 VOTING PREFERENCES                                                 Rep        Dem      Ind         Row Total Male                                      350         075         25           450 Female                                 275         240         35           550 Column Total                     625         315         60           1000 Is there a gender gap? D3 the men's voting preferences differ significantly from the women's preferences? Use...
q5. A random sample of 500 persons was taken in a certain area if test is...
q5. A random sample of 500 persons was taken in a certain area if test is positive for the covid-19. let 60 persons were found with positive test. obtain 98% confidence limit for the proportion of the covid 19 positive cases
A random sample of 500 persons is questioned regarding their political affiliation and opinion on a...
A random sample of 500 persons is questioned regarding their political affiliation and opinion on a tax reform bill. The observed contingency table is given below: Favored Indifferent Opposed Row total Democrat 138 83 64 285 Republican 64 67 84 215 Column total 202 150 148 500 Which variable can be reasonably thought of as the dependent variable, and which is the independent variable? What is the probability that a person favored the tax reform bill, given that the person...
Life test performed on a sample of 13 batteries of a new model indicated one and...
Life test performed on a sample of 13 batteries of a new model indicated one and average life of 75 months and to a standard deviation of 5 months other battery models produced by similar processes have normally distributed lifespans the 90% confidence interval for the population mean the life of the new model is
Problem 3. Of a random sample of 500 Americans, 270 indicated that they would vote for...
Problem 3. Of a random sample of 500 Americans, 270 indicated that they would vote for a Democrat in the upcoming election for president. Find a 90% confidence interval estimate for the population proportion and interpret it. A critic claims that the true proportion is .50. Test the validity of this claim against a two- sided alternative at the 10% level of significance. In answering, write out the null and alternative hypotheses in addition to the decision rule. Show your...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT