A researcher wants to calculate the prevalence of Alzheimer’s among members of a specific community who are 65 years of age and older. The researcher needs to know how many individuals who are 65 years of age or older need to be recruited for the study to ensure the estimated prevalence will be within 1.0% of the true proportion. Calculate the sample size needed by the researcher if a national study has shown 10.73% of individuals 65 years of age have Alzheimer’s based on a 95% CI of the true proportion.

Q: How do you calculate the sample variance for proportions when the sample is drawn from a dichotomous…

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Q: A researcher is conducting a study to examine what factors influence older adult's Binge Drinking…

A: There are two independent samples which are women and men. We have to test whether there is a…

Q: A random sample of 100 patients treated in a program for alcoholism and drug dependency over the…

A: It is given that the sample of patients selected, n is 100 and number of patients readmitted at…

Q: You work for NASA and are interested in determining the population proportion, with 99% confidence,…

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Q: newspaper infographic titled "Social Media Jeopardizing Your Job?" summarized data from a survey of…

A: Given: It is assumed that the sample is the representative of population. Thus, Sample…

Q: the sample size is 30 for each group, there are 3 groups, and the mean score for football players is…

A: Mean square between: The between group variation is how much variation it is due to the interaction…

Q: I can't seem to figure out D & E

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Q: The personnel director of the Target Corporation wants to estimate the number of employees within…

A: Given that  Sample size n =80 Favorable cases x =4 Sample proportion p^=x/n  =4/80 =0.05

Q: Education Less than high school 3599 High school graduate/GED 8000 Some college/tech school 10,408…

A:

Q: Why do you think any serious researcher would use the sample mean to estimate for the population…

A: Generally research is carried out to determine a particularoutcome in the targeted…

Q: How much difference is there between the mean for the treated sample and the mean for the original…

A: Definition Sample Mean x It is the mean of all the values of a sample.   Population μ It is the mean…

Q: Gallup surveyed adult Americans about their consumer debt. They Reported that 47% of millennials and…

A: Given information: Proportion of millennials who did not pay off their credit cards p1=0.47…

Q: which is the best sampling method for qualitative research, with a target population of 30?

A: Introduction There are 2 types of sampling method: Probability sampling method Non-probability…

Q: If you have a sample size of 500, should you interpret the statistical significance or the effect…

A: Statistical Significance:Statistical significance, often represented by a p-value, indicates whether…

Q: A school district is considering moving the start of the school day at Groveland High from 8:00 a.m.…

A: The correct option is "option A"  Explanation: The two samples are independent Samples are taken…

Q: A rare birth defect occurs in approximately 0.5% of all cases in males. If we sample all the males…

A: Given information: The total number of males born in 2016 in a specific region is N = 200,000. It is…

Q: Is the Chebyshev's rule used only with populations? Are samples used as well?

A: Yes, Chebyshev’s rule can be applied to population as well as sample.We should know the following…

Q: Online gamers are divided into different age groups. A random sample from each group is selected and…

A: From the given information we want to know method of sampling.

Q: A television sports commentator wants to estimate the proportion of citizens who​ "follow…

A: Solution: From the given information, confidence level is 0.96 and E=0.02.

Q: To further test the nature of the association between tuition rates and graduation rates, the…

A: We want to find the  relationship between tution rate and graduation rate

Q: What are the steps for finding the relative frequency of sample means above or below a specified…

A: The sampling distribution of sample means is approximately a normal distribution because of the…

Q: Although Nielsen Media research determined the precise proportion of all Americans watching the…

A: Given : Nielsen Media research determined the precise proportion of all Americans watching the super…

Q: If the sample size is n=16 what is likely true about the shape of the population?

A: Solution:  Central limit theorem: The central limit theorem state that as the sample size increases…

Q: A pool of 500 Houston residents indicated that 16% of them participated in Women’s March on January…

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Q: Example 11.A company engaged in selling ballpoint pens wishes to estimate the proportion of people…

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Q: If we would like to decrease the margin of error without changing the sample size, what must happen?

A: We have to find what to do to decrease margin of error.

Q: According to a census company, 7.1% of all babies born are of low birth weight. An obstetrician…

A: Here we conduct Z test for proprtion.

Q: Thirty-three percent of all Americans drink bottled water more than once a week (Natural resources…

A: Note: Hi there! Thank you for posting the question. Unfortunately in the sub-part(b), some required…

Q: Why a sample size of n=100 is more likely to have a percentage of pop songs closer to the population…

A: Sample of size 32 or greater is consider as large sample .

Q: should their sample size be?

A: here use solvin's formula

Q: In the Star and Tribune newspaper, there is an article entitled “1 in 8 school buses fail tests."…

A: Given information: Sample of 200 buses and find that 20 buses fail the safety inspection. Let us…

Q: According to the Law of Large Numbers what effect will increasing the sample size have on the sample…

A: It is given that the sample size increases.

Q: What value should we expect for our sample proportion?

A: We have to answer question based on proportion.

Q: Explain the EFFECT OF SAMPLE SIZE.

A: The size of our sample defines how much information we have and thus, in part, decides our precision…

Q: To determine the proportion of Americans who support affirmative action policies for minorities and…

A: The objective is to define the sample size for estimating the true proportion of Americans, who…

Q: Explain about if larger the sample size, what does this reflects.

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Q: To study how water pollution has affected fishery, a scientist randomly selected 8 lakes of Florida.…

A: Given: Mercury Alkalinity 1.3 6 0.7 27 0.2 84 0.2 67 1.3 3 0.5 25 0.5 30 0.3 82

Q: How to decide one or Two Samples?

A: t-test:  (i) In the t-test, the sample size of 30 is large enough (n < 30) (ii) Samples are taken…

Q: (a) State the null hypothesis H and the alternative hypothesis H₁. Ho :O H₁:0 (b) Determine the type…

A: Given, n1=10, n2=10, σ1=6400 and σ2=6600 Level of significance=0.10

Q: A health organization wants to estimate the population proportion of Ohioans who have received the…

A: From the provided information, Margin of error (E) = 0.04 Confidence level = 99%

Q: What is the importance of getting a sample from a population? When and why is it necessary?

A: The population is defined as a large group in which the units involved have the same…

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.