Suppose you conduct a sample with n=15 where the sample mean is 15 and the standard deviation is 4. Why can’t you construct a 94% confidence interval? A) The sample size is too small B) The underlying distribution is not normal C) We can’t use a 94% level with the tables that we have D) We can indeed construct such an interval, the premise of the question is wrong E) None of the above

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Q: Assume that 66 % of single women and 81.9 % of single men own cars. Also assume that these estimates…

A: Given data, p1=66%=0.66 n1=1640 p2=81.9%=0.819 n2=1800 z-value at 99% confidence is Zc=2.576

Q: 2. Suppose that the sample mean temperature of 31 hot air balloons (in flight) is 97° Celsius with a…

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Q: a. We wish to construct a 90% confidence interval for the difference between the two population…

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Q: a) A new machine is used to pack coffee powder. The mass of a packet follows a normal distribution…

A: The mean and standard deviation for the sample data are computed as follows:

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Q: ind a 95% confidence interval for the difference between the two proportions.   b) Is there a…

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Q: According to the stock index, the return from January 2014 to December 2014 shows the average of 7%…

A: 4)Assume that the population standard deviation is 2.5$.The provided information is:

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Q: 1.) True or False a.) A 99% confidence interval estimate can be interpreted to mean that 99%…

A: Here we have given two statements, we have to identify the given statements are true or false.

Q: A sociologist develops a test to measure attitudes about public transportation and 11 randomly…

A: Given information :Mean(xˉ)=76.2s=21.4n=11c=95%=0.95Step 2:The margin of error calculated by the…

Q: A random sample of size 30 is taken from a normal distribution with standard deviation 9. The…

A: A random sample of size 30 is taken from a normal distribution with standard deviation 9. The sample…

Q: 2. Construct a 99 % Confidence interval for µ. You may use any method covered in class. Blood…

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Q: (b) If the sample size were n = 36, would the confidence interval still be valid? (Choose one)

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Q: In what are we confident after we’ve calculated a 95% confidence interval – the value of that…

A: still wrong. The 95% is not for the construction of the interval, but for the method of constructing…

Q: 7.What value of z would you use to caleulate the 98% confidence interval for a population mean,…

A: It is given that the confidence level is 0.98.

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Q: each of the computer database of the Marriot and Westin hotels are given in th following table.…

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Q: Marty Funkhouser has a sample of 64. He finds a sample average of 34 and a sample standard deviation…

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Q: a) If the standard deviation is 0, then the variance is                . b) The Empirical Rule…

A: a) Variance=(standard deviation)2=02=0b) The Empirical Rule states that approximately 68% of the…

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A: It is given that 74% out of 200 people said that they do go to Truecar.com before they go shopping…

Q: 2. A large university conducted a sample survey of 100 first-year students and 100 seniors. Both…

A: given that,sample one, x1 =32, n1 =100, p1= x1/n1=0.32sample two, x2 =38, n2 =100, p2=…

Q: 3) A sample of 25 automobiles shows that the mean price was $20,500 with standard deviation of…

A: 3) Given; The sample size;n=25The sample mean;x¯=20500The sample standard deviation;s=2500 (a) Here…

Q: If other factors are held constant, what happens to a confidence interval if the sample variance…

A: Solution:  The confidence interval when the sample standard deviation unknown can be determine as…

Q: 4. The following sample of numbers is chosen from a normally distributed population. 22, 25, 28, 30,…

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Q: ample of n = 16 scores has a mean of M= 58 with SS = 960. Use the sample to construct the 95%…

A: It is given that M =58 and SS = 960.

Q: A recent CNN poll found that of 1010 adults, only 622 were willing to get vaccinated with the…

A: a)

Q: Aprofessor wants to make sure that two different versions of a test are equivalert He decides to…

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Q: 23. The Confidence Interval for the Pearson r statistic is not symmetrical. It means that the…

A: Not symmetrical means Not equally distributed. Hence the answer is true.

Q: Suppose that a random sample of 11 scores from a population of test scores is to be used to estimate…

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Q: Sample of 40 sizes were taken from Group A and a sample of 39 sizes were taken from Group B. Group A…

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Q: 26. IQ is normally distributed with a mean of 100 and a standard deviation of 15. a) Find the…

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Q: How large of a sample needs to be taken

A: It is given that Confidence level = 98%Margin of error, E = 1.5% = 0.015

Q: Which of the following statement(s) about confidence intervals are correct? 1) There is no…

A: We know that the formula for the confidence interval is- We can see that the margin of error is…