The personnel director of a large corporation determines the keyboarding speed,
ID: 3376153 • Letter: T
Question
The personnel director of a large corporation determines the keyboarding speed, on certain standard materials, of a random sample of secretaries from her company. She wants to know whether the keyboarding speed of secretaries at her company is different from the national mean of 50, with a standard deviation of 5. She conducts her study and finds a mean of 48 for 20 secretaries. Use the .05 level of significance to answer her question.
1. What are the null and alternative hypotheses for the test of a confidence interval?
H0: ?>50; H1: ?< 50
H0: ?<50; H1: ?> 50
H0: ?= 50; H1: ?? 50
H0: ?< 48; H1: ?> 48
a.H0: ?>50; H1: ?< 50
b.H0: ?<50; H1: ?> 50
c.H0: ?= 50; H1: ?? 50
d.H0: ?< 48; H1: ?> 48
Explanation / Answer
as our hypothesis is directionless(tow tailed) cause we are not checking if mean is less then or mnore than 50 but if it is different from 50.
option C is correct
H0: ?= 50; H1: ?? 50
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.