the one-proportion z-test to perform the specified hypothesis test. Use the crit

Question

the one-proportion z-test to perform the specified hypothesis test. Use the critical-value approach. x = 728, n = 1300, H_0: p = 0.5, H_a: p > 0.5, a = 0.05 A) z = 4.327; critical value = 1.645; reject H_0 B) z = 3.245; critical value = 1.645; reject H_0 C) z = 3.245; critical value = 1.96; do not reject H_0 D) z = 4.327; critical value = 1.96; reject H_0 A researcher was interested in comparing the salaries of female and male employees at particular company. Independent simple random samples of 8 female employees and 15 male employees yielded the following weekly salaries (in dollars). Determine a 98% confidence interval for the difference between the mean weekly salary of female employees and the mean weekly salary of male employees at this particular company. A) -$375 to $151 B) -$411 to $188 C) -$311 to $88 D) -$431 to $208

Explanation / Answer

9) correct ans is A):

Excel formula:

10)

fORMULA :

obsereved proportion p= 0.56 SD 0.496387 Std error= 0.013767 z= Point estimate/SE 4.358154 Z-critical= 1.644854 Z>Z critical; so reject H0

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