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 random sample of 80 people was selected, and 22 of the selected people indicated that it would be…

A:

Q: According to the same Pew Internet study, 8% of those with broadband connections are using fixed…

A: The p-value of the test is 0.103. The decision is fail to reject H0.

Q: A June 2020 Angus Reid poll of 1510 Canadian adults found that 53% support the idea of a 30 hour…

A: Given Data: p^=0.53n=1510   z-value corresponding to 95% Confidence level=1.96

Q: To construct a confidence interval for each of the following quantities, say whether it would be…

A: Note: Hey, since multiple subparts are posted, we will answer first three subparts according to our…

Q: A researcher is interested in whether patients have better results with a new treatment as compared…

A:

Q: 4. The World Health Organization reports that in a sample of 10,013 people globally, 9 in 31 people…

A: We know, we calculate CI for a single proportion with the formula z*=1.96 for 95%          1.645 for…

Q: A November 2018 CBS News Poll found that 35% of its sample planned to use online retailers for most…

A: Given that, A November 2018 CBS News Poll found that 35% of its sample planned to use online…

Q: When a survey asked subjects whether they would be willing to accept cuts in their standard of…

A: It is given that 362 out of 1,180 subjects respond yes.The sample proportion is 362/1,180 =…

Q: he drug Viagra became available in the U.S. in May 1988, in the wake of an advertising campaign that…

A: a).

Q: A Gallup poll of 1001 Americans age 18 and over conducted in May of 2013 found that 80% of the…

A: Confidence Interval: Confidence interval is the interval estimate of the population parameter. It is…

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: Discuss how much of the following factors affects the width of the large-sample two-sided confidence…

A: Confidence interval is given by

Q: In a recent questionnaire about home ownership, a random sample of 545 homeowners were asked about…

A: A random sample of 545 homeowners were asked about the rate of mortgage, whether that is fixed or…

Q: In practice, if we don’t know whether the population is normal and our sample size is less than 30,…

A: If we don't know whether the population is normal. In this case we can check it easily by two…

Q: The National Weight Control Registry tries to mine secrets of success from people who lost at least…

A: X: People on a low-carbohydrate diet. X=439 n=2720

Q: What is the value of Z for this confidence interval?

A: Given,sample size(n)=14795no.of people who said yes=2219no.of people who said no =12576

Q: A &B

A: The provided data mentions the value of sample size, n is 928 and the value of x is 128. The…

Q: Refer to the following scenario. A government official is in charge of allocating social programs…

A:

Q: If the sample size is reduced by 25%, which of the followings is true about the change in the length…

A:

Q: b. Construct a confidence interval suitable for testing the claim that the mean IQ scores for…

A: b. Here, medium lead level is the first sample and high-level lead is the second sample.   The…

Q: . A researcher collects a sample of 24 measurements from a population and wishes to find a​ 99%…

A: The degrees of freedom is,

Q: he drug Viagra became available in the U.S. in May 1988, in the wake of an advertising campaign that…

A: A confidence interval estimate is an interval estimate that includes the unknown population…

Q: To construct a confidence interval for each of the following quantities, say whether it would be…

A: Note: Hey there! Thank you for the question. As you have posted a question with multiple sub-parts,…

Q: What value of z should be used to calculate a confidence interval with a 95% confidence level?

A: The z value which is used to calculate 95% confidence interval is defined as P(-zvalue < Z <…

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

A: The known values are, The sample proportion is, Critical values: Using the z-table, the critical…

Q: Gallup is a company that conducts daily opinion polls on a variety of topics. In a recent daily…

A: Given that, Sample size, n = 1000 38% of the sample said they were committed to their work.

Q: Use Table V in Appendix A to determine the t-percentile that is required to construct each of the…

A: It is given that the degrees of freedom is 24 and the confidence level is 0.999.

Q: Determine the t-percentile that is required to construct each of the following one-sided confidence…

A:

Q: A researcher computed a 90% confidence interval for the proportion of students who smoke. If the…

A: False. Relationship between confidence level and error:The error value increases when the confidence…

Q: Market research indicates that a new product has the potential to make the company an additional…

A: It is given that,Sample mean = $3.8 million.Sample standard deviation, s is $1.8 million.The sample…

Q: A market analyst is curious what proportion of Los Angeles residents have a landline telephone. A…

A: Given that, A survey of 200 randomly selected Los Angeles residents shows that 96 of those selected…

Q: The following are body mass index (BMI) scores measured in 12 patients who are free of diabetes and…

A:

Q: A random sample of students at a college shows that 54 of 200 students had part-time jobs. Which of…

A: It is given that x is 54 and n is 200.

Q: In the context of the previous problem, construct a 99% confidence interval estimate of the mean red…

A: Given information Sample size n = 50 Sample mean = 4.63 Population standard deviation = 0.54…

Q: 1(c). Construct a 99% confidence interval for the true proportion of people who liked the chocolate…

A: here use given data table

Q: The true proportion of c.c. students in her state, that receive an AD, is contained in that specific…

A: It is given that the confidence interval in b is calculated correctly.

Q: A recent survey of cell phone users indicated that 56 percent of the respondents prefer to use cell…

A: Given that 56% of the respondents prefer to use cell phones for texting rather than for making phone…

Q: 1) In a four-year psychedelic-mushroom experiment, 93 of the 300 subjects reported experiencing…

A: It is given that:

Q: A wider confidence interval gives a greater level of confidence than a narrower one (when working…

A: When we increase the confidence level then confidence interval become wider.

Q: In a recent questionnaire about homeownership, a random sample of 545 homeowners were asked about…

A:

Q: Hi. How do you calculate this problem? Is there a way to do this on a TI-83? Thanks.

A: Note:Hi, we are solving this problem with manual calculations. Thank you.

Q: A poll conducted in January 2020 surveyed likely democrat primary voters about who they would vote…

A: Confidence Interval: Confidence interval is the interval estimate of the population parameter. It is…

Q: The table below shows the number of car wrecks that occur during certain times of the day: Time 12 -…

A: Part (A) The 95% confidence interval for proportion of wrecks is given by the formula: Find the…

Q: The Universal Music Group is the music industry leader worldwide in sales according to the company…

A: The random variable music sales follow normal distribution. The sample size is 1003. The sample…

Q: Refer to the following scenario. A government official is in charge of allocating social programs…

A: Given, n=121 X=Number of people whose annual income lies below poverty line. = 25

Q: A clinic offers a weight-loss program. A review of its records found the following amounts of weight…

A: Given data is appropriate for t-test because the sample size is less than 30. so, we need to go far…

Q: In the construction of a confidence interval, if all other quantities are unchanged, an increase in…

A: Property of confidence interval:

Q: 1) Jaimie does a study on how many students have passed his classes in the past. He finds that 2739…

A: The random variable students who pass follow normal distribution. The number of successes is 2739.…

Q: Suppose that a safety group surveyed 1,100 drivers. Among those​ surveyed, 65​% said that careless…

A: Obtain the confidence interval estimate for the true proportion in the population of all drivers who…

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.