comfortably or not. Of the 1007 surveyed, 525 stated that they were worried about having enough money to live comfortably in retirement. Construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement. Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2). Click here to view the table of critical t-values. Click here to view the table of critical values of the chi-square distribution. Select the correct choice below and fill in the answer boxes to complete your choice. (Use ascending order. Round to three decimal places as needed.) A. There is 90% confidence that the true proportion of worried adults is between B. 90% of the population lies in the interval between and. C. There is a 90% probability that the true proportion of worried adults is between and and

Q: The height of women ages 20-29 is normally distributed, with a mean of 64 inches. Assume a 2.7…

A: Mean (μ) = 64Standard deviation(σ)=2.7Sample size(n) = 27

Q: Quartering a positive mean (dividing by 4) has what effect on the normal curve?

A: The normal distribution: A continuous random variable X is said to follow normal distribution if the…

Q: The national average SAT score for verbal and math is 1028. Assume a normal distribution with…

A:

Q: In a survey of 1001 adults, a polling agency asked, "When you retire, do you think you will have…

A: Given data: n = 1001 X = 530

Q: Under what conditions can the mean of the sample be treated as a value that is from a population…

A: From the above data  under what conditions can the mean of the sample be treated as a value that is…

Q: A study was made to determine whether more Italians than Americans prefer white champagne to pink…

A: From the given information we conduct Z test for proportion.

Q: What is the best way to evaluate the normal approximation of the variable? Scatter plot. Normal…

A: The objective of the question is to identify the best method to evaluate the normal approximation of…

Q: The distribution of sample proportions tends to approximate a normal distribution. true or false?

A: The sample proportion is the number of favorable outcomes to the total number of outcomes. It is…

Q: What would a skewness of .163 mean? Is this normal distribution?

A: Solution:  Skewness: Skewness can be defined as the lack of symmetry in the data set.  In other…

Q: Why is the standard deviation of a sampling distribution smaller than the standard deviation of the…

A: According to information provided in the question, it is required to determine the reason why the…

Q: If you view the company’s performance record as a representative sample of its overall sales…

A: Data given in order Monthly Sales 6267.19 7058.06 7119.5 7147.18 7198.52 7298.09…

Q: What are the Properties of the Normal Curve?

A: A normal curve is identified using the values of the mean and standard deviation to show the…

Q: Which kind of descriptive statistics can be included to summarize the quantitative data? if the…

A:

Q: For a perfectly symmetrical distribution with µ= 30, what is the median?

A: Given: for a Perfectly Symmetrical Distribution with µ = 30,   To Find: median

Q: Find the percentile points of your z-value under the normal curve. z score is = -1.46  source :…

A: Given:

Q: Consider you recently took an exam in your history class and your exam has been returned to you. The…

A: Given: Consider you recently took an exam in your history class and your exam has been returned to…

Q: A poll asked whether states should be allowed to conduct random drug tests on elected officials. Of…

A:

Q: What is the relationship between the standard deviation of the population and the standard deviation…

A:

Q: When calculating the confidence interval for a population mean, we should use a normal distribution…

A: According to the central Limit theorem The mean of sample following the normal distribution as the…

Q: For a standard normal curve, find the z-score that separates the bottom 70% from the top 30%.

A: Answer:- Given, a standard normal curve,               Find the z-score that separates the bottom…

Q: Twenty years ago, 53% of parents of children in high school felt it was a serious problem that high…

A: We have given that the hypothetical proportion p0 = 0.53, the sample size n = 800 and favourable…

Q: what is the normal curve?  explanations and examples would help. I am very grateful.

A: A normal curve is a well- shaped curve that shows the probability distribution of continuous random…

Q: Statisticians believe that if a test is valid, it should follow a normal distribution with a mean of…

A: Statisticians believe much time if the test is valid it follows Normal Distribution many times but…

Q: Find a 95% confidence interval for the difference between full attendance students' Exam 5 score and…

A: We have given data,  Less attendance Full attendance 90 96 90 96 60 100 50 99 69   88…

Q: 2. A survey found that 73% of respondents currently have a job. Is 73% a statistic or a parameter?…

A: Given that  Sample proportion p^=0.73 Parameter is based on population.

Q: What percentage of scores falls in the tails of a normal curve?

A: Empirical rule: According to empirical rule, 99.7% of data lies within three standard deviations of…

Q: For a normal distribution, the mean is equal to the median. True False

A: The Normal distribution is Symmetric distribution. So,  Mean = Median = Mode.

Q: In a survey of 1016 adults, a polling agency asked, "When you retire, do you think you will have…

A: Sample size n =1016Favorable cases x =533confidence level=90%Sample proportion()=

Q: What is the difference between a STATISTIC and PARAMETER

A: Solution:We have to determine the difference between a STATISTIC and PARAMETER.

Q: Define the term statistic.

A: We have to define the term statistic.

Q: What is the difference between a normal and binomial distribution?

A: Statistics uses normal distributions more often than binomial distributions most of the time.…

Q: what is the importance of knowing the concepts of a normal curve?

A:

Q: Give a brief example of an empirical distribution of data.

A: This question is about providing a brief example of an empirical distribution of data.

Q: Diabetes and unemployment:  A 2012 Gallup poll surveyed Americans about their employment status and…

A: The survey results indicate that 1.5% of the 47,774 employed and 2.5% of the 5,855 unemployed 18-29…

Q: A food snack manufacturer samples 11 bags of pretzels off the assembly line and weighs their…

A:

Q: About what percentage of a normal distribution falls within 2.5 standard deviations of the mean?

A: 98.76 percentage of a normal distribution falls within 2.5 standard deviations of the mean

Q: Roughly speaking, what are the normal scores corresponding to a sample of observations?

A: The normal scores corresponding to a sample of observations are observations and expect same sample…

Q: Why does the mean inaccurately summarize a skewed distribution?

A: If the distribution is symmetric then mean is accurately summarized the data because it is exactly…

Q: What is the significance of the “normal” distribution? Please provide explanation/example.

A: Normal distribution is a probability distribution that is generally symmetric about the mean, as the…

Q: On a normal curve, where do most scores fall?

A:

Q: What are the parameters for a normal curve?

A: Normal distribution: Normal distribution is defined based on mean (µ) and standard deviation (σ).…

Q: Find the 56th percentile of the standard normal distribution.

A: the 56th percentile of the standard normal distribution