Question

Karen wants to advertise how many chocolate chips are in each Big Chip cookie at her bakery. She randomly selects a sample of 65 cookies and finds that the number of chocolate chips per cookie in the sample has a mean of 16.3 and a standard deviation of 3.8. What is the 90% confidence interval for the number of chocolate chips per cookie for Big Chip cookies? Enter your answers accurate to 4 decimal places. [ , ] (Report and round to 4 decimal places)

Test the claim that the proportion of people who own cats is smaller than 50% at the 0.10 significance level. The null and alternative hypothesis would be: H 0 : μ ≥ 0.5 H 1 : μ < 0.5 H 0 : μ = 0.5 H 1 : μ ≠ 0.5 H 0 : p = 0.5 H 1 : p ≠ 0.5 H 0 : p = 0.5 H 1 : p < 0.5 H 0 : p = 0.5 H 1 : p > 0.5 H 0 : μ ≤ 0.5 H 1 : μ > 0.5 The test is: left-tailed two-tailed right-tailed Based on a sample of 200 people, 44% owned cats The test statistic is: (to 3 decimals) The p-value is: (to 4 decimals) Based on this we: Fail to reject the null hypothesis Reject the null hypothesis

We wish to estimate what percent of adult residents in a certain county are parents. Out of 400 adult residents sampled, 92 had kids. Based on this, construct a 95% confidence interval for the proportion p of adult residents who are parents in this county. Give your answers as decimals, to 4 places. Answer = ± (Note this is NOT in interval form, so check your answer carefully)

Answer 1