A recent study indicated that 24% of the 137 women over age 55 in the study were widows. Round up your answers to the next whole number for the following questions. How large a sample must you take to be 99% confident that the estimate is within 0.05 of the true proportion of women over age 55 who are widows? If no estimate of the sample proportion is available, how large should the sample be?

Q: If there were 760 students in Jamal’s class, approximately how many students scored higher than…

A: The probability that z-score is greater than 1.41 is calculated as follows: PZ>1.41=1-PZ≤1.41…

Q: A group of 100 people, who lived at varying distances (in kilometers) from an island nuclear power…

A: Given that there are 100 people. Therefore, the table becomes,    0-3 km distance 3-6 km distance…

Q: According to the Bureau of Labor Statistics, there were 27,900 computer and research information…

A: We can draw the following table to accumulate the above information :                     YEAR…

Q: A recent poll of 800 people who work indoors found that 208 of them smoke. If the researchers wnat…

A: The sample proportion can be calculated as: p=x/n=208/800=0.26 At a 98% confidence level, the z…

Q: In most research, what does the p-value have to be for results to be considered statistically…

A: Here we want to know correct option.

Q: For numbers 6-10, use the data in the table below that summarizes results from a clinical trial of…

A: “Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: how smart are PHS students? in an attempt to answer this question, you select a random sample of 38…

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

Q: Select the correct statement below   a) If the nineteenth percentile has a value of 0.8, this…

A: We know if X is pth  percentile value that means their are p percent values are less than X.

Q: For a population with μ = 40 and σ = 7, find the z-score for each of the following X values. (Note:…

A: The Z-score for an X value of 45 is, Thus, the Z-score for an X value of 45 is 0.714.

Q: Marlene estimates that 48% of 1,220 is about 600. Which statement describes why this is a reasonable…

A: 48% of 1220 means approx 50% of 1200. Because there is 2% increase in percentage value and 20…

Q: The brand manager for a brand of toothpaste must plan a campaign designed to increase brand…

A: The formula for the sample size is as follows: Here,zα/2 is the critical value at 95% confidence…

Q: A recent study indicated that 22% of the 173 women over age 55 in the study were widows. Round up…

A:

Q: You are told that your IQ scores falls at the 79th percentile.  What conclusion could you make about…

A: Percentiles: If the elements in the data set are arranged in ascending order of magnitude, then the…

Q: In a study of over 15,000 teens, 62% of boys and 55% of girls consumed sugar-sweetened soda on the…

A:

Q: The brand manager for a brand of toothpaste must plan a campaign designed to increase brand…

A: Given information- Margin of error, E = 7% = 0.07 Confidence level, c = 80% Since nothing is known…

Q: 1) what proportion of students scored above student 33 on homework 3? 2) what proportion of students…

A: Given:   Student ID HW 1 HW 2 HW 3 1 98 93 99 2 81 80 64 3 66 91 75.5 4 84 94 80 5 65…

Q: From the information in the article, in a town consisting of 2,300 rich students born in 1980, how…

A: The total number of rich students in 1980 = 2300Here the graph is plotted parents Income percentile…

Q: Because of safety considerations, in May 2003 the Federal Aviation Administration (FAA) changed its…

A: Confidence interval : ( 180.024, 185.976) interpretation: b. We are 95% confident that the true…

Q: A discussion of digital ethics appears in an article. One question posed in the article is: What…

A: n = Zα/2E2p^(1-p^)

Q: The table to the right shows the number of people testing positive for a certain disease amongst…

A: Required probability is P(tested positive | have disease)

Q: s the newly hired manager of a company that provides cell phone service, you want to determine the…

A: It is given that margin of error (E) is 0.92 and the confidence level is 0.90.

Q: A company conducted a survey to see whether its new toothpaste was more popular with children or…

A:

Q: Two doctors asked 6 of their patients, who were smokers, how many years they had smoked. In…

A: Given, Two doctors asked 6 of their patients, who were smokers, how many years they had smoked. In…

Q: For a population with  = 80 and  = 9, find the z-score for each of the following X values. (Note:…

A: It is given that the mean is 80 and the standard deviation is 9.

Q: For a population with m = 80 and s = 9, find the z-score for each of the following X values. (Note:…

A: Given Information: m = 80 and s = 9 Z-score is standardized value that specifies the exact location…

Q: In research about the population of a county with 100,000 inhabitants, a sample of 3000 households…

A: According to the provided data, a total of 3000 households were contacted to participate in the…

Q: skipping lunch- A nutritionist wishes to determine, within 3%, the true proportion of adults who do…

A: It is given that margin of error (E) is 0.03 and the confidence level is 95%.

Q: A researcher wishes to estimate the proportion of adult males who are less than 5 feet 5 inches…

A: It is given that margin of error (E) is 0.04 and the confidence level is 0.90.

Q: An immunologist is interested in whether the number of symptoms of the flu a person first exhibits…

A: The test is to check whether the number of symptoms of the flu a person first exhibits is related to…

Q: If there were 500 students in Jamal’s class, approximately how many students scored higher than…

A:

Q: In a random sample of college freshmen, the proportion who use text messaging daily was 0.93. In a…

A: Given, In a random sample of college freshmen, the proportion who use text messaging daily was 0.93…

Q: What proportion of the general population has an IQ of 70 or less?

A: It is an important part of statistics. It is widely used.

Q: Because of safety considerations, in May 2003 the Federal Aviation Administration (FAA) changed its…

A: a) The 95% confidence interval for the population mean summer weight of Airline passenger is given…

Q: the brand manager for a toothpaste brand must plan a campaign designed to increase brand…

A: The error is ±1.96×p1-pn=0.05assume p=0.5. This will give the most conservative estimate square on…

Q: According to Deloitte, through January 25,2006, the majority of companies reporting profits had…

A:

Q: A sociologist wants to determine if the life expectancy of people in Africa is less than the life…

A:

Q: Read the following problem description then choose the correct null and alternative hypothesis.  A…

A: It is an important part part of statistics. It is widely used.

Q: When estimating the population proportion, how large a sample is needed to be 95% confident that the…

A: Here  sample proportion = 42/120= 0.35

Q: What is the value of SS for this sample?

A: Given: n = 4  Σ X = 4 Σ X 2 = 32 The formula to calculate the SS is as follows:

Q: You have been tracking how much you spend on gas every month for several months and found that on…

A: The interquartile range is the difference between the third quartile and the first quartile and it…

Q: The brand manager for a brand of toothpaste must plan a campaign designed to increase brand…

A: Solution: From the given information, confidence level is 0.95 and E=0.05. Since the proportion is…

Q: In research about the population of a county with 100,000 inhabitants, a sample of 3000 households…

A: The number of households not willing to participate in the survey is 1200.

Q: The head of a computer science department is interested in estimating the proportion of students…

A: Solution: From the given information, confidence level is 0.95, p=0.35 and E=0.10.

Q: One researcher wants to estimate the proportion of MU students who are vegetarian, 6 answered "yes".…

A:

Q: (a) What proportion of college graduates answered yes when asked if they had ever used online…

A: The assumed CI for the difference in proportions is,     (p^1-p^2)±(Z * SE)where Standard Error…

Q: Suppose that we want to estimate what proportion of gift items purchased at a department store are…

A: Given ME= 0.05 Confidence level=95℅

Q: (d) How high a score must you have in order to be in the top quarter of the population in social…

A: (d) The high score for order to be in the top quarter of the population in social insight is,…

Q: A recent study indicated that 24% of the 150 women over age 55 in the study were widows. Round up…

A: Given That  Margin of error =E =0.02 Population proportion p=24%=0.24 90% confidence interval.

Q: What percent of our campus is female? If no preliminary study is made to estimate, how large a…

A: Given that no preliminary sample is taken to estimate the proportion of females. let the sample size…

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.