The National Weight Control Registry tries to mine secrets of success from people who lost at least 30 pounds and kept it off for at least a year. It reports that out of 2,720 registrants, 439 were on a low-carbohydrate diet (less than 90 grams a day). a. Develop a 95% confidence interval for the proportion of people on a low-carbohydrate diet. b. Is it possible that the population percentage is 16%? c. How large a sample is needed to estimate the proportion within 0.55%?

Q: A trade magazine routinely checks the drive-through service times of fast-food restaurants. An 80%…

A: Given  Level of significance=0.20  Lower limit=177.5  Upper limit=180.9

Q: Breathing rates, in breaths per minute, were measured for a group of 5 subjects at rest, and the…

A:

Q: 88% of California adults (444 out of 506 surveyed) feel that education is one of the top issues…

A: The value of z at a 90% confidence level is 1.645, which can be obtained by using the standard…

Q: Suppose that the a college wants to have an idea of the average SAT score of the incoming freshman…

A: The confidence level is 0.90, the standard deviation is 310 and margin of error E is 50.

Q: . How many of the 3335 subjects used at least one prescription​ medication? b. Construct a​ 90%…

A: n = 3335 p = 0.804

Q: In a survey of 3110 adults aged 57 through 85 years, it was found that 87.9% of them used at least…

A:

Q: An epidemiologist is worried about the prevalence of the flu in East Vancouver and the potential…

A: The random variable flu follows binomial distribution. X ~ B (n, p). The sample size is 337. The…

Q: In terms of z scores, a 95% confidence interval consists of which of the following ranges? 1. ±1 z

A: Given, Z=x-μσ where, x= observed value μ=mean of the sample σ=standard deviation

Q: If n = 370 and p=0.31p, construct a 90% confidence interval. This should be rounded to three decimal…

A:

Q: A 95 percent confidence interval for the proportion of parents who use parental controls for…

A: The  CI for the parent's proportion blocking, filtering, or monitoring teenagers' online…

Q: In one community, a random sample of 25 foreclosed homes sold for an average of $443,776 with a…

A: From the provided information,Standard deviation (s) = 196739Sample mean (x̄) = 443776Sample size…

Q: In a survey of 3015 adults aged 57 through 85 years, it was found that 85.6% of them used at least…

A:

Q: All residents of Homer Glen, IL (N = 21,000). You want to estimate the mean age of each population…

A: Sample size n=7595% confidence level.

Q: A developmental psychologist would like to determine how much fine motor skill changes for children…

A: In statistical inference, there are two types of estimation,  Point estimation and Interval…

Q: Use the following to answer the next two questions. A 2020 poll found that 520 out of 824 randomly…

A:

Q: A study was conducted to measure the effectiveness of hypnotism in reducing pain. The measurements…

A: Given data: Before After 10.2 6.9 7.3 2.9 9.7 7.2 11.4 8.6 11.1 8.4 9.5 6.4 4.1…

Q: one with a 95% confidence level and the other with a 99.7% confidence level. Which interval is…

A: Confidence interval is probability, which refers that population parameter will fall within set of…

Q: General Social

A:

Q: We are interested in comparing the percentage of females versus males who expect their future to be…

A: Summarising the given information below. The number of total surveyed females and males:…

Q: 1992, the women in two statistics classes for students in the liberal arts at a large northeastern…

A: In 1992, the women in two statistics classes for students in the liberal arts at a large…

Q: If α = 0.05, then what is the confidence level?

A: Given: α = 0.05   we know that, Confidence level+ α = 1

Q: On September 14, 2000, a cross-sectional survey of 24,000 residents of a western state revealed that…

A: Given: n = 24000 Number of tuberculosis cases X = 145 Proportion p^ = Xn Formula Used: Confidence…

Q: A pharmaceutical company is running tests to see how well its new drug lowers cholesterol. Eleven…

A: From the provided information, Sample size (n) = 11 Confidence level = 95%

Q: In order to estimate the percentage of adults who file their taxes at least two weeks before the…

A: The given 95% confidence interval is, 0.759 to 0.841 The values of sample proportion and margin of…

Q: Refer to the following scenario. An epidemiologist is worried about the prevalence of the flu in…

A: The formula of sample size is, Use EXCEL Procedure for finding the critical value of z.   Follow…

Q: The branch manager of an outlet store​ (Store 1) of a nationwide chain of pet supply stores wants to…

A: Comment: As per the our company guidelines we are supposed to answer only three subparts. Kindly…

Q: Latasha is a waitress at Seventh Heaven Hamburgers. She wants to estimate the average amount each…

A:

Q: Five fourth-grade children were selected at random from the entire class and timed in a short race.…

A: Given data : The times in seconds were 6.3, 4.2, 4.7, 6.0, and 5.7

Q: Records from the Washington Department of Licensing show that 47 former SFCC business students have…

A: Given data is 7 , 12 , 13, 17, 10, 5 , 10 , 6sample size(n)=8

Q: An investigative reporter contacts a random sample of hotels, and finds a 95% confidence interval…

A: Given that  The 95% confidence interval for the proportion of hotels in the united states have…

Q: The clinical testing of drugs involves many factors. For example, patients that have been given…

A: Percentage = 100*Proportion We are given only one sample of size n=500, so we will not be using two…

Q: The report of a sample survey of 1,014 adults says, "With 95% confidence, the true population…

A: The objective of the question is to understand the meaning of the term '95% confidence' in the…

Q: The police department wants to reduce the margin of error for their 95% confidence interval. If they…

A: Here Given  The police department wants to reduce the margin of error for their 95% confidence…

Q: If 64% of a sample of 550 people leaving a shopping mall claims to have spent over $25 create and…

A: Given,   Sample size = 550 Sample proportion = 0.64   Critical value: Using z-table, the z-critical…

Q: Refer to the following scenario. An epidemiologist is worried about the prevalence of the flu in…

A: To find the sample size required for estimating the population proportion with a 95% confidence…

Q: If n= 220, p-hat= .4, then what will be the 87.4% confidence interval for the population proportion?

A:

Q: An epidemiologist is worried about the prevalence of the flu in East Vancouver and the potential…

A:

Q: Listed below are the amounts of net worth​ (in millions of​ dollars) of the ten wealthiest…

A: Sample size(n)=10sample mean(x¯)=171standard deviation(s)=33.79020degrees of…

Q: registered. Construct a 90% confidence interval for the proportion of first-time visitors who saw…

A: Let p be the population proportion of first-time visitors who saw the new design that registered.…

Q: The width of a confidence interval is a measure of its precision. The narrower the confidence…

A: Confidence interval

Q: Come up with  your own data for a problem that would ask for a 90% confidence interval utilizing Z.…

A:

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.