(b) A medical statistician wants to estimate the average weight loss of people who are on...
(b) A medical statistician wants to estimate the average weight loss of people who are on a new diet plan. In a preliminary study, he guesses that the standard deviation of the population of weight losses is about 10 pounds. How large a sample should he take to estimate the mean weight loss to within 2 pounds, with 90% confidence.
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(b) A medical statistician wants to estimate the average weight
loss of people who are on...
Amanda Reaves , a zookeeper, wants to estimate the average weight gain of elephants who are...
Amanda Reaves , a zookeeper, wants to estimate the average weight gain of elephants who are on a new diet plan. A preliminary study found the standard deviation was estimated to be 5.50 kilograms. Determine the sample size that is required to estimate a population mean to within 0.95 kilograms with a 90% confidence interval.
A statistician wants to estimate the mean loss suffered by Delta pilots in the labor negotiations...
A statistician wants to estimate the mean loss suffered by Delta pilots in the labor negotiations to lower Delta salaries to within $2500 with 95% confidence. From a first small survey, the standard deviation of the loss is estimated at $10,000. What size sample should the statistician select? 1 A. 206 B. 44 C. 7 D. None of the above
Does this diet help? A group of 78 people enrolled in a weight loss program that...
Does this diet help? A group of 78 people enrolled in a weight loss program that involved adhering to a special diet and to a daily exercise program. After six months, their mean weight loss was 27 pounds, with a sample standard deviation of 10 pounds. A second group of 43 people went on the diet but didn't exercise. After six months, their mean weight loss was 15 pounds, with a sample standard deviation of 8 pounds. Construct a 99.9%...
You are a statistician and wish to estimate, with 90% confidence, the proportion of adults who...
You are a statistician and wish to estimate, with 90% confidence, the proportion of adults who will vote during an election. Your estimate must be accurate within 2.5% of the population proportion. Find the minimum sample size needed, using a prior study that found that 73% of the respondents said they voted during the last election.
7. You want to estimate the mean weight loss of people one year after using a...
7. You want to estimate the mean weight loss of people one year after using a popular weight-loss (1 point) program being advertised on TV. How many people on that program must be surveyed if we want to be 95% confident that the sample mean weight loss is within 0.25 ib of the true population mean? Assume that the population standard deviation is known to be 10.6 lb. 6907 0 4865 O 84 O6906 3. Given the standard deviation of...
A group of 78 people enrolled in a weight-loss program that involved adhering to a special...
A group of 78 people enrolled in a weight-loss program that involved adhering to a special diet and to a daily exercise program. After six months, their mean weight loss was 25 pounds, with a sample standard deviation of 9 pounds. A second group of 43 went on the special diet, but did not exercise. After six months, their mean weight loss was 14 pounds, with a sample standard deviation of 7 pounds. a. What function would be used to...
Hays Medical Center wants to estimate the percentage of adults who exercise at least 1 hour...
Hays Medical Center wants to estimate the percentage of adults who exercise at least 1 hour per week. How large a sample should be selected in order to estimate this proportion with a 90% confidence level and a margin of error of at most 5%? (Assume no preliminary estimate of p-hat is available.)
1. A random sample of 82 customers, who visited a department store, spent an average of...
1. A random sample of 82 customers, who visited a department store, spent an average of $71 at this store. Suppose the standard deviation of expenditures at this store is O = $19. What is the e 98% confidence interval for the population mean? 2. A sample of 25 elements produced a mean of 123.4 and a standard deviation of 18.32 Assuming that the population has a normal distribution, what is the 90% confidence interval for the population mean? 3....
m wered of A group of 78 people enrolled in a weight-loss program that involved adhering...
m wered of A group of 78 people enrolled in a weight-loss program that involved adhering to a special diet and to a daily exercise program. After six months, their mean weight loss was 25 pounds, with a sample standard deviation of 9 pounds. A second group of 43 went on the special diet, but did not exercise. After six months, their mean weight loss was 14 pounds, with a sample standard deviation of 7 pounds. a. What function would...
The producer of a weight-loss pill advertises that people who use the pill lose, after one...
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 60 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...
Does this diet help? A group of 78 people enrolled in a weight loss program that involved adhering to a special diet and to a daily exercise program. After six months, their mean weight loss was 27 pounds, with a sample standard deviation of 10 pounds. A second group of 43 people went on the diet but didn't exercise. After six months, their mean weight loss was 15 pounds, with a sample standard deviation of 8 pounds. Construct a 99.9%...
7. You want to estimate the mean weight loss of people one year after using a popular weight-loss (1 point) program being advertised on TV. How many people on that program must be surveyed if we want to be 95% confident that the sample mean weight loss is within 0.25 ib of the true population mean? Assume that the population standard deviation is known to be 10.6 lb. 6907 0 4865 O 84 O6906 3. Given the standard deviation of...
A group of 78 people enrolled in a weight-loss program that involved adhering to a special diet and to a daily exercise program. After six months, their mean weight loss was 25 pounds, with a sample standard deviation of 9 pounds. A second group of 43 went on the special diet, but did not exercise. After six months, their mean weight loss was 14 pounds, with a sample standard deviation of 7 pounds. a. What function would be used to...
1. A random sample of 82 customers, who visited a department store, spent an average of $71 at this store. Suppose the standard deviation of expenditures at this store is O = $19. What is the e 98% confidence interval for the population mean? 2. A sample of 25 elements produced a mean of 123.4 and a standard deviation of 18.32 Assuming that the population has a normal distribution, what is the 90% confidence interval for the population mean? 3....
m wered of A group of 78 people enrolled in a weight-loss program that involved adhering to a special diet and to a daily exercise program. After six months, their mean weight loss was 25 pounds, with a sample standard deviation of 9 pounds. A second group of 43 went on the special diet, but did not exercise. After six months, their mean weight loss was 14 pounds, with a sample standard deviation of 7 pounds. a. What function would...
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