If not, I understand 6. Using the following data, What is the standard error of

Question

If not, I understand 6. Using the following data, What is the standard error of the mean (round to two-decimals). Use a known population mean 47, a two-tailed testand an = .05. Use StatCrunch. 55 48 59 50 48 52 50 48 57 54 50 52 54 43 44 53 40 46 50 51 a. 4.69 b. 1.05 c. 3.23 d. 2.87 Suppose we have a sample mean of 12, estimate standard error of the mean of 2.5, and a t-critical value of 2.306. What would be the lower and upper limits of our confidence interval? a. 6.235; 17.765 b. 9.5; 14.5 c. 9.694; 14.306 d. 7.205; 16.775

Explanation / Answer

7. Sample mean = 12
Std error = 2.5
t-critical = 2.306

Lower and upper limits are given by : Sample mean +/- tcritical*Stderror
=12 +/- 2.306*2.5
=6.235 to 17.765

a. is right

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