Question

Use standard normal and t-Distribution tables

You are expected to use the Standard Normal and the t-Distribution Tables for all answers on this quiz. You must algebraically calculate the Margin or Error by hand for problems requiring that. Calculator-produced probabilities or confidence intervals will receive minimal credit. 1. (1.5 points) A survey of 177 fatal accidents showed that, in 42 cases, the driver at fault was inadequately insured. Find a point estimate for the population proportion, p, of accidents where the driver at fault was inadequately insured. (Use 3 decimal places for proportions.) 2. (4.5 points) The amount of corn chips dispensed into a 10-ounce bag by the dispensing machine of a factory has been identified as possessing a normal distribution, with a mean of 10.5 ounces and a standard deviation of 0.2 ounce. Suppose 54 bags of chips were randomly selected from this dispensing machine. Find the probability that the sample mean weight of those 54 bags is less than 10 ounces 3. (6.5 points) A university Dean is interested in determining the proportion of students who receive some sort of financial aid. Rather than examine the records for all students, the dean randomly selects 200 students and finds that 123 of them are receiving financial aid. By hand, and using formulas for the "Margin of Error", find a 92% confidence interval to estimate the true proportion of students on financial aid

Answer 1