**Unformatted text preview: **Question 3
In the following, find the indicated confidence interval where the indicated standard error comes from a bootstrap distribution that is approximately
Correct
normally distributed.
6.00 points out
of 6.00
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1. A 95% confidence interval for a proportion p if the sample has n = 100 with p = 0.43 and the standard error is SE = 0.05 is 0.33
question
to 0.53
2. A 90% confidence interval for a mean / if the sample has n = 30 with x = 23.1 and s = 5.7 and the standard error is SE = 1.04 is
21.39
24.81
3. A 99% confidence interval for a proportion p is the sample has n = 200 with p = 0.78 and the standard error is SE = 0.03 is 0.7
to 0.86
Question 4
Find the value of the standardized z-test statistic in each situation below:
Correct
3.00 points out
1. Test Ho : M = 80 vs Ha : M > 80 when the sample has n = 20, x = 82.4, and s = 3.5 with SE = 0.8. z = 3
of 3.00
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2. Test Ho : p = 0.25 vs Ha : P < 0.25 when the sample has n = 800, p = 0.235 with SE = 0.018. z = -0.83
question
3. Test Ho : M1 = M2 VS Ha : M1 > M2 when the sample has nj = n2 = 50, x1 = 35.4, x2 = 34.1. The standard error of X1 - X2 is
SE = 0.25. z = 5.2
Question 5
Use pnorm() or xpnorm() to find the p-value based on a standard normal distribution for each of the following standardized test statistics:
Correct
5.00 points out
1. z = 0.84 for an upper tail test p= 0.2
of 5.00
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2. z = 2.25 for a two-tailed test p= 0.024
question
3. z = -2.38 for a lower tail test p= 0.0087
4. z = 4.12 for an upper tail test p= 1.9E-5
5. z = -1.58 for a two-tailed test p= 0.11...

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- Spring '08
- Watson