An infinite population has a standard deviation of 10. A random sample of 100 items from this population is selected. The sample mean is determined to be 60. At 98% confidence, the margin of error is 1.28 1.645 1.96 2.33 None of the above The z value for a 90% confidence interval estimation is 1.28 1.645 1.96 2.33 2.576 The t value for a 90% confidence interval estimation with 24 degrees of freedom (not the sample size n) is 1.317836 1.710882 2.063899 2.492159 2.796939 A random sample of 144 observations has a mean of 20, a median of 21, and a mode of 22. The population standard deviation is known to equal 3.6. The 90% confidence interval for the population mean is 19.62 to 20.38 19.51 to 20.49 19.41 to 20.59 19.30 to 20.70 A random sample of 144 observations has a mean of 20, a median of 21, and a mode of 22, and a standard deviation of 3.6.. The 90% confidence interval for the population mean is 19.60 to 20.40 19.48 to 20.52 19.33 to 20.67 18.20 to 20.80 A random sample of 64 students at a university showed an average age of 20 years and a sample standard deviation of 4 years. The 90% confidence interval for the true average age of all students in the university is 19.58 to 20.42 19.35 to 20.65 19.15 to 20.85 19.00 to 21.00 The following random sample from a population whose values were normally distributed was collected. 10 15 11 12 The 95% confidence interval for μ is 11.00 to 13.00 10.23 to 13.77 9.46 to 14.54 8.56 to 15.44 For a two-tailed Z-test at a 0.05 level of significance; the table (critical) value -1.96 and 1.96 -1.645 and 1.645 -2.33 and 2.33 -2.575 and 2.575 For a one-tailed Z-test at a 0.10 level of significance; the table (critical) value -1.96 and 1.96 -1.645 and 1.645 -1.28 and 1.28 -2.575 and 2.575 n = 36 H0: 20 = 22 Ha: > 20 = 12 The test statistic equals 1.30 1.00 -1.30 1.50 n = 36 H0: ≥ 20 = 18 Ha: < 20 = 6 The p-value equals 0.1587 0.0668 0.0228 0.0107 n = 36 H0: ≥20 = 18 Ha: < 20 = 12 If the test is done at a .05 level of significance, the null hypothesis should not be rejected be rejected Not enough information is given to answer this question. None of the other answers are correct. n = 9 H0: = 50 = 48 Ha: 50 s = 3 Assume data are from normal population The p-value is equal to 0.0171 0.0805 0.2705 0.2304 n = 36 H0: 20 = 22 Ha: > 20 s = 6 The p-value equals 0.0267 0.0403 0.1621 0.1733 = 36 H0: μ ≥ 20 = 18 Ha: μ < 20 s = 6 If the test is done at a .05 level of significance, the null hypothesis should not be rejected be rejected Not enough information is given to answer this question. None of the other answers are correct. n = 9 H0: = 50 = 53 Ha: 50 = 3 Assume data are from normal population The p-value is equal to 0.0455 0.0027 .