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Test of hypotheses

1. From past records, a hospital found that 37% of all full-term babies born in the hospital weighed more than 7 pounds 2 ounces. This year a sample of 100 babies showed that 23 weighed over 7 pounds 2 ounces. At a level of significance of 2%, is there enough evidence to say the percentage has changed?

2. A recent study stated that the average single person household received at least 37 telephone calls per month. To test the claim, a researcher surveyed 29 single person households and found that the average number of calls was 34.9. The standard deviation of the sample was 6. At a level of significance of 1%, can the claim be rejected?

3. The manager of a large factory believes that the average hourly wage of the employees is more than $9.78 per hour. A sample of 18 employees has a mean hourly wage of $9.96. The standard deviation of all salaries is $1.42. At a level of significance of 5%, is there enough evidence to support the manager's claim?

Directions: Test the following hypotheses using the Traditional Method. You must show all the steps involved and the final statement must be phased appropriately for the problem.

Solution Summary

The solution tests hypotheses.