Question
In: Statistics and Probability
The personnel director of a large corporation determines the keyboarding speed, on certain standard materials, of...
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
Solutions
Expert Solution
One sample Z test:
Z-critical: 
The test statistic:
P-value: 0.074
The test statistic is not significant and failed to reject H0. There is insufficient evidence to support the claim that the keyboarding speed of secretaries at her company is different from the national mean of 50.
orchestra answered 2 years agoRelated Solutions
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