j

Question 1

Express the confidence interval left parenthesis 0.079 comma 0.129 right parenthesis(0.079,0.129) in the form of ModifyingAbove p with caret minus Upper E less than p less than ModifyingAbove p with caret plus Upper EpE

Question 2

In the week before and the week after aholiday, there were 10,000 totaldeaths, and 4956of them occurred in the week before the holiday. a. Construct a 90% confidence interval estimate of the proportion of deaths in the week before the holiday to the total deaths in the week before and the week after the holiday. b. Based on theresult, does there appear to be any indication that people can temporarily postpone their death to survive theholiday? a.?less than

b. Based on theresult, does there appear to be any indication that people can temporarily postpone their death to survive theholiday? Which of the two below is correct?

Yes, because the proportion could noteasily equal 0.5. The interval isis substantially less than 0.5 the week before the holiday.

No, because the proportion couldeasily equal 0.5. The interval is notisnot less than 0.5 the week before the holiday.

Question 3

An online site presented thisquestion, 'Would the recent norovirus outbreak deter you from taking acruise?' Among the 34,586 people whoresponded, 66% answered'yes'. Use the sample data to construct a 90% confidence interval estimate for the proportion of the population of all people who would respond'yes' to that question. Does the confidence interval provide a good estimate of the populationproportion? nothingless than

Question 4

Do one of thefollowing, as appropriate.

(a) Find the critical value z Subscript alpha divided by 2z/2,

(b) find the critical value t Subscript alpha divided by 2t/2,

(c) state that neither the normal nor the t distribution applies. Confidence level 99%; nequals=15; sigma is knownisknown; population appears to be very skewed. Which of the answers below is correct? A. z/2.575B. z/2=2.33C. t/2=2.624D. t/2=2.977 E. Neither normal nor t distribution applies.

Question 5 data set includes 110 body temperatures of healthy adult humans for which x =98.0degreesF and s equals 0.74 degrees . Complete parts(a) and(b) below.

a. What is the best point estimate of the mean body temperature of all healthyhumans?The best point estimate is ?degreesF.(Type an integer or adecimal.)

b. Using the samplestatistics, construct a 99% confidence interval estimate of the mean body temperature of all healthy humans. Do the confidence interval limits contain 98.6degreesF? What does the sample suggest about the use of 98.6degreesF as the mean bodytemperature?What is the confidence interval estimate of the population mean mu? ?degreesFless than

What does this suggest about the use of 98.6degreesF as the mean bodytemperature?A. This suggests that the mean body temperature could be lower thanbelowerthan 98.6degreesF. B. This suggests that the mean body temperature could be higher thanbehigherthan 98.6degreesF. C. This suggests that the mean body temperature could very possibly beverypossiblybe 98.6

Question 7

In order to estimate the mean amount of time computer users spend on the internet eachmonth, how many computer users must be surveyed in order to be 95% confident that your sample mean is within 15minutes of the populationmean? Assume that the standard deviation of the population of monthly time spent on the internet is 190min. What is a major obstacle to getting a good estimate of the populationmean? Use technology to find the estimated minimum required sample size. The minimum sample size required is nothing computer users. (Round up to the nearest wholenumber.) What is a major obstacle to getting a good estimate of the populationmean? A. It is difficult to precisely measure the amount of time spent on theinternet, invalidating some data values. B. There may not be 617computer users to survey. C. The data does not provide information on what the computer users did while on the internet. D. There are no obstacles to getting a good esitmate of the population mean.

Question 8

If we find that there is a linear correlation between the concentration of carbon dioxide in our atmosphere and the globaltemperature, does that indicate that changes in the concentration of carbon dioxide cause changes in the globaltemperature? Choose the correct answer below. A. Yes. The presence of a linear correlation between two variables implies that one of the variables is the cause of the other variable. B. No. The presence of a linear correlation between two variables does not imply that one of the variables is the cause of the other variable.

Question 10

For a sample of eightbears, researchers measured the distances around thebears' chests and weighed the bears. Minitab was used to find that the value of the linear correlation coefficient is requals=0.871. Using alphaequals=0.05, determine if there is a linear correlation between chest size and weight. What proportion of the variation in weight can be explained by the linear relationship between weight and chestsize?

a. Is there a linear correlation between chest size andweight? A. Yes, because the absolute value of the test statistic exceeds the critical value of 0.707. B. No, because the absolute value of the test statistic exceeds the critical value of 0.707. C. Yes, because the test statistic falls between the critical values of 0.707 and 0.707D. The answer cannot be determined from the given information.b. What proportion of the variation in weight can be explained by the linear relationship between weight and chestsize? nothing (Round to three decimal places asneeded.)