Set up the null and alternate hypotheses for each of the problem statements.Do not do anything else!

a.An anthropologist claims that 12% of humans are left-handed.Based on a random sample of 110 humans you find 18% are left-handed.Does the sample suggest the percentage of left-handed humans is greater than that claimed by the anthropologist?

H₀:

H_a:

b.A CEO claims that employees at her company spend 120 minutes or less a day surfing the net while at work.Based on a random sample of 10 employees, the mean surfing time of 125 minutes with a standard deviation of 9 minutes.At the 10% LOS, Does the sample support the CEO's claim?

H₀:

H_a:

c.A magazine article claims more than 50% of workers get their jobs through networking.Based on a random sample of 703 workers, 53.5% got their job through networking.Does the sample provide evidence in favor of the magazines claim?

H₀:

H_a: