Question

1. A researcher expects the population proportion of FIFA fans in Abu Dhabi to be 80 percent. The researcher wishes to have an error of less than 5 percent and to be 98 percent confident of an estimate to be made from a mail survey. What sample size is required?

2. A study is being conducted to compute the price of a hand cream. The researcher needs the error range of the price to be within $1, and suspects that the population standard deviation would be around $29.

a. What sample size would we require if we desired a 99 percent confidence level?

b. What about if we keep the confidence level 95%, but decide that our acceptable error is $4?

3. Suppose you are planning to sample transportation employees to determine average annual sick days. The following standards have been set: a confidence level of 99 percent and an error of fewer than 5 days. Past research has indicated the standard deviation should be 6 days. What is the required sample size?

4. Liverpool manager believes that, on average of 3.01, their supporters consider their game in EPL neither enjoyable nor not enjoyable.

	Sample Size = 350 Average enjoyable (x̄) = 3.18 Standard Deviation = 1.75

Develop Hypothesis:

Null Hypothesis (H_o)                       : ___________________________________________

Alternate Hypothesis (H₁)             : ___________________________________________

Test the hypothesis using 3% significant level:

Decision Rule

Reject Ho

Fail to reject Ho

Interpret

5. A pilot training manager has hypothesized that 30 percent of the pilot want more flying hours during night compare to daylight flying.

Sample Size = 235

% in Favor (p) = 0.47

% not in Favor (q) = __________

In the random interview it seem only 45 percent preferred night flying.

Develop Hypothesis:

Null Hypothesis (H_o)                       : ___________________________________________

Alternate Hypothesis (H₁)             : ___________________________________________

Test the hypothesis using 9 % significance level

Decision Rule

Reject Ho

Fail to reject Ho

Interpret

Answer 1

( 1 )

sample size ( n ) = 347