# Question: Let p equal the proportion of drivers who use a

Let p equal the proportion of drivers who use a seat belt in a state that does not have a mandatory seat belt law. It was claimed that p = 0.14. An advertising campaign was conducted to increase this proportion. Two months after the campaign, y = 104 out of a random sample of n = 590 drivers were wearing their seat belts. Was the campaign successful?

(a) Define the null and alternative hypotheses.

(b) Define a critical region with an α = 0.01 significance level.

(c) What is your conclusion?

(a) Define the null and alternative hypotheses.

(b) Define a critical region with an α = 0.01 significance level.

(c) What is your conclusion?

**View Solution:**## Answer to relevant Questions

Let X and Y denote the heights of blue spruce trees, measured in centimeters, growing in two large fields. We shall compare these heights by measuring 12 trees selected at random from each of the fields. Take α ≈ 0.05, ...A course in economics was taught to two groups of students, one in a classroom situation and the other online. There were 24 students in each group. The students were first paired according to cumulative grade point averages ...Let X be N(μ,100). To test H0: μ = 80 against H1: μ > 80, let the critical region be defined by C = {(x1, x2, ... , x25) : x ≥ 83}, where x is the sample mean of a random sample of size n = 25 from this ...Assume that the weight X in ounces of a “10- ounce” box of cornflakes is N(μ, 0.03). Let X1, X2, . . . , Xn be a random sample from this distribution. (a) To test the hypothesis H0: μ ≥ 10.35 against the alternative ...A random sample of 50 women who were tested for cholesterol was classified according to age and cholesterol level and grouped into the following contingency table.Post your question