Question

1. A newsletter publisher believes that 61% of their readers own a personal computer. Is there sufficient evidence at the 0.10 level to refute the publisher's claim?

State the null and alternative hypotheses for the above scenario.

2.A local police chief claims that about 44% of all drug related arrests are ever prosecuted. A sample of 700 arrests shows that 47% of the arrests were prosecuted. Is there sufficient evidence at the 0.05 level to refute the chief's claim?

State the null and alternative hypotheses for the above scenario.

3.At the local college, a study found that students earned an average of 9 credit hours per semester. A sample of 99 students was taken. What is the best point estimate for the average number of credit hours per semester for all students at the local college?

4. The mean monthly electric bill for 52 residents of the local apartment complex is $⁢67. What is the best point estimate for the mean monthly electric bill for all residents of the local apartment complex?

Answer 1

1. Here claim is that p=0.61

So hypothesis here is vs

2. Here claim is that p=0.44

So hypothesis here is vs

3. Here sample size is too large, so as per central limit theorem sample mean is normally distributed with

4. Mean estimate is