24) Choose the statement that best describes estimating the population mean A) T

Question

24) Choose the statement that best describes estimating the population mean A) The standard deviation of the sampling tis meant when we say that the sample mean is smbiased when 5) The sample on (also called the standard erroe) and the popalation C) On average, the sample mean is the same as the p D) None of these standard devi l always equal the population mean. Use the following information for the nest two questions A hamburger chain sells large hamburgers. A random 25 ha deviatcon ample of 25 hamburgers is taken and each is weighed. The mean of 25) Suppose you were 2064 to ed o findhe 95 % What MARGIN of error should you use? Use the plert" nfidence interval. A) 0.006 B) 0061 C) 0.207 D) 0.012 26) Find the 95% confidence interval for the population mean weight of hamburgers sold by this chain. A) (0.198, 0266) B) (0.209,0.311) C) (0248, 0272) D) (0.250, 0.270) Use the following information to answer the next two questions. Many couples beleve that it is getting too host an of a wedding in the US in 2009 was $24,000 Recently, in a random sample od oo expensive to host an-average-wedding. According to one source, the average cost tionofS2,90·Onén basis of these statistics, a 95% confidence interval for the mean cost of 40 weddings in the U.S. the average cost was weddings in the U.S. is $22,296 to $24.152 27) Does the confidence interval provide evidence that the mean cost of a A) No, because the interval contains some valaes higher than $24,000. B) Yes, becauzse the interval contains some valaes higher than $24.000 C) No, because most values in the interval are less than $24,.000 D) Yes, because most valses in the Interval are less than $24,000. 25) Which is the best interpretation of a 95% confidence inserval? l means that we are 95% confident that the sample mean is between the low A)The 95% B) The 95% confidence interval C) The 99% confidence interval values, al mears that we are 95% con Ment that the population mean is between the intmal means that there is aprobability that the population mean is between plerval means that there is a 95% probability that the sample mean is between the we are low and high interval values the low and high inberval values low and high interval values As dhe sample size increases, the sandard error of the sample means A) also increases B) remains the same C) may increase or decrease D) decreases A-s

Explanation / Answer

24) option C) is most close

25) margin of error = t * s/sqrt(n) = 2.064* 0.03/sqrt(25) = 0.012384

d) 0.012 is correct

26)

(0.26-0.012,0.26+0.012)

=(0.248,0.272)

option C) is correct

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