A restaurant manager is concerned about customer complaints regarding the taste of a popular dish, Chicken Alfredo. To address this issue, the chef has been experimenting with two different recipes. Recipe 1 is the traditional and well-established method, while Recipe 2 is a new, cost-effective approach. The restaurant has conducted taste tests with two separate random samples of customers who tried only one each of the recipes. For Recipe 1, the average rating on a scale of 1 to 10 was 7.6, with a standard deviation of 1.1. For Recipe 2, the average rating was 6.7, with a standard deviation of 2.5. Recipe 1 Recipe 2

The Difference of Two Sample Proportions: III Belinda plans to take a simple random sample of 2500 U.S. adults and to compute the proportion of them who believe in the theory of evolution. (Call this sample proportion p1-hat.) She also intends to take an independent simple random sample of 1600 adults from France and to compute the the proportion of them who believe in the theory of evolution. (Call this sample proportion p2-hat.) Unknown to Belinda, the proportion of all U.S. adults who believe in the theory of evolution is 0.50 (or 50%), whereas the proportion of all French adults who believe in the theory of evolution is 0.75, or 75%. Using the expected value and the SD of p1-hat minus p2-hat, which of the following makes the most sense? Group of answer choices   (  ) The percentage of adults in the U.S. sample who believe in evolution should turn out to be about 25% less than the percentage of adults in the French sample who believe in evolution, give or take about 3% or so for…

In your biology class, your final grade is based on several things: a lab score, scores on two major tests, and your score on the final exam. There are 100 points available for each score. However, the lab score is worth 19% of your total grade, each major test is worth 21.5%, and the final exam is worth 38%. Compute the weighted average for the following scores: 95 on the lab, 82 on the first major test, 64 on the second major test, and 86 on the final exam.

A study found that the ratio between the number of people who drive cars and the number of people who ride bicycles is 1:3. Additionally, of those who drive cars, one out of five drive electric cars, Out of all people who drive cars and ride bicycles, which of the following represents the percentage of people who use non-electric gasoline cars? Select the single best answer: A. 10% B. 13% C. 20% D. 25% E. This cannot be determined.

The brand manager for a brand of toothpaste must plan a campaign to increase brand recognition. He wants to first determine the percentage of adults who have heard of the brand. How many adults must he survey in order to be 98% confident that his estimate is within five percentage points of the true population percentage? (Assume that nothing is known about the percentage of adults who have heard of the brand.)

Anita's, a fast-food chain specializing in hot dogs and garlic fries, keeps track of the proportion of its customers who decide to eat in the restaurant (as opposed to ordering the food "to go"), so it can make decisions regarding the possible construction of in-store play areas, the attendance of its mascot Sammy at the franchise locations, and so on. Anita's reports that 45% of its customers order their food to go. If this proportion is correct, what is the probability that, in a random sample of 5 customers at Anita's, exactly 3 order their food to go?

The American Heart Association is about to conduct an anti-smoking campaign and wants to know the fraction of Americans over 38 who smoke. Step 1 of 2:  Suppose a sample of 273 Americans over 38 is drawn. Of these people, 79 smoke. Using the data, estimate the proportion of Americans over 38 who smoke. Enter your answer as a fraction or a decimal number rounded to three decimal places.   Step 2 of 2:  Suppose a sample of 273 Americans over 38 is drawn. Of these people, 79 smoke. Using the data, construct the 85% confidence interval for the population proportion of Americans over 38 who smoke. Round your answers to three decimal places.   Lower end point, upper end point

A nutritionist estimates that 57% of her patients stick to the eating plan she helps them design. She also knows that 53% of her patients are diabetic. Additionally she knows that 22.79% of her patients are diabetic and are not sticking to the eating plan she helped them design. (a) What proportion of her patients are not sticking to the eating plan she helped them design? (b) What proportion of her patients are diabetic? (c) Within the nutritionist's patients, being diabetic and not sticking to the eating plan she helped design are which of the following? O dependent O independent

Cory is serving coffee in a large reception with many guests. There are two kinds of coffee: regular anddecaf. So far, he has served 71 cups of regular and 49 cups of decaf.Question 3.Based on the information so far:(a) Estimate the proportion of coffee-drinking guests who prefer regular.