The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an average (mean) of 1.85 pounds with a standard deviation of 0.95 pounds. In a recent study, a group of 55 people who used this pill were interviewed. The study revealed that these people lost a mean of 1.9 pounds after one week. If the producer's claim is correct, what is the probability that the mean weight loss after one week on this pill for a random sample of 55 individuals will be 19 pounds or more? Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places. 0 X 5

An ecologist is examining whether the number of fish caught in a large river basin has changed since a fire burned some of the surrounding forested area and vegetation along the river. Data in the form of fishing reports was available for a five-year period before the fire. From a random sample of 195 fishing reports before the fire, the mean catch was 6.3 fish with a standard deviation of 1.6. In a random sample of 143 reports three years after the fire, the mean catch was 7.1 fish with a standard deviation of 2.1. Which of the following represents the standard error of the difference in the mean number of fish caught before and after the fire?

The amounts of time students study for an exam follows a normal model with a mean of 6 hours and a standard deviation of 1.5 hours. what is the probability a student studies between 3.5 and 5.5 hours?

An article in the San Jose Mercury Newsstated that students in the California state university system take 4.5 years,on average, to finish their undergraduate degrees. Suppose you believe that the mean time is longer. You conduct a survey of 89 students and obtain a sample mean of 5.3 with a sample standard deviation of 1.4. Do the data support your claim at the 1% level?

The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an average (mean) of 1.8 pounds with a standard deviation of 1.05 pounds. In a recent study, a group of 45 people who used this pill were interviewed. The study revealed that these people lost a mean of 1.83 pounds after one week. If the producer's claim is correct, what is the probability that the mean weight loss after one week on this pill for a random sample of 45 individuals will be 1.83 pounds or more? Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places.

The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an average (mean) of  1.75  pounds with a standard deviation of  0.95  pounds. In a recent study, a group of  45  people who used this pill were interviewed. The study revealed that these people lost a mean of  1.83  pounds after one week. If the producer's claim is correct, what is the probability that the mean weight loss after one week on this pill for a random sample of  45  individuals will be  1.83  pounds or more? Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places.

Researchers doing a study comparing time spent on social media and time spent on studying randomly sampled 200 students at a major university. They found that students in the sample spent an average of 2.3 hours per day on social media and an average of 2.17 hours per day on studying. If all the students at the university in fact spent 2.2 hours per day on studying, with a standard deviation of 2 hours, the probability of getting a sample average of 2.17 or less is:   a. 0.0023.   b. 0.9932.   c. 0.5792.   d. 0.4160.

The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an average (mean) of 1.85 pounds with a standard deviation of 1.02 pounds. In a recent study, a group of 55 people who used this pill were interviewed. The study revealed that these people lost a mean of 1.88 pounds after one week. If the producer's claim is correct, what is the probability that the mean weight loss after one week on this pill for a random sample of 55 individuals will be 1.88 pounds or less? Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places. Check esc @ %23 y e tab

In a recently conducted study, families reported using an average of 70 gallons of gasoline per month with a standard deviation of 8 gallons. If a family is chosen at random, what is the probability that it uses between 61 and 79 gallons of gasoline per month? Assume the data is normally distributed.

School-age children should drink approximately 40.5 oz of water per day according to a recent report. Suppose the amounts of water that schoolchildren actually consume in day are approximately normally distributed with a mean of 32.0 oz and a standard deviation of 7.1 oz. What is the probability that a randomly selected student will drink less than the suggested amount of water in a day? If the standard deviation remained the same and the daily water intakes were still normally distributed, how much would the mean need to increase so that only 5% of students drink less than 36 oz per week?