A study of 420,064 cell phone users found that 136 of them developed cancer of the brain or nervous system. Prior to this study of cell phone​ use, the rate of such cancer was found to be 0.0343​% for those not using cell phones . Use the sample data to construct 95​% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system

Q: A population of values has a normal distribution with u = 7.8 and o = 47.7. If a random sample of…

A: Given A population of values has a normal distribution with mu = 7.8 and sigma = 47.7 sample of size…

Q: A random sample of 21 Camden County College students had a mean age of 24 years, with a standard…

A:

Q: What sample size is needed if a researcher needed to calculate the true proportion of individuals…

A: HERE , MOE  = 0.01 confidence level = 95% here z-critical for 95% confidence level = 1.96 here use…

Q: For 30 randomly selected Rolling Stones concerts the mean gross earnings is 2.59 million dollars.…

A:

Q: A laboratory tested 58 chicken eggs and found that the mean amount of cholesterol was 109…

A: Given Information: Sample size (n) = 58 Sample mean (x¯) = 109 milligrams Population standard…

Q: We wish to estimate what per cent of 18 to 25-year old's that own a Samsung phone. Out of 400…

A:

Q: A researcher wanted to examine the effect of a new math study skills program on second graders.…

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

Q: The time married men with children spend on child care averages 6.1 hours per week (Time, March 12,…

A: The hypotheses can be constructed as: H0: µ = 6.1 H1: µ ≠ 6.1 Sample size (n) = 40 Assume level of…

Q: Suppose you do a small-scale study to find out whether relationship satisfaction is related to…

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Q: According to the National Health Statistics Report, a sample of 360 one year old baby boys in the US…

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Q: suppose an individual was studying temperature's effect on crime rate. The researcher looked at 6…

A: Solution:The sample mean is obtained below:From the given information, number of observations is 6…

Q: Suppose you do a small-scale study to find out whether relationship satisfaction is related to…

A: Given that  SStotal = 109.744 , SStreatment = 45.744 Total participants = n = 39 Each treatment has…

Q: According to the American Medical Association, the average annual of radiologists in the USA are…

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Q: It is required to construct a (1−?)100% confidence interval for the true population median, M using…

A: A sign test is non-parametric. In case of a sign test, we compare the medians, M, instead of the…

Q: In a poll, 1200 adults in a region were asked about their online vs. in-store clothes shopping. One…

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Q: Due to the economy, are Americans staying in their first professional job longer? This was a ques-…

A: Given that,

Q: What is the impact on the confidence interval estimate if a larger sample is used?

A: Confidence interval:

Q: Falling coconuts kill over 150 people each year, which is more than the number of people who die…

A: This question asks about the conditions necessary to calculate a confidence interval for the true…

Q: In a poll, 1200 adults in a region were asked about their online vs. in-store clothes shopping. One…

A: Answer:- Given, Sample size, n = 1200  Sample proportion, p = 38% = 0.38  Confidence level = 95% =…

Q: a socialogist expects the life expenancy of people in africa is different than the life expantancy…

A: From the provided information, the following values are given as:

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: A drug is used to help prevent blood clots in certain patients. In clinical​ trials, among 4406…

A: The best point estimate of the population proportion p is obtained below: Thus, the proportion is…

Q: Researchers from a certain country were interested in how characteristics of the spleen of residents…

A: Males Sample size, n1=93 Sample mean, x¯1=11.2 Sample sd, s1=0.8   Females Sample size, n2=107…

Q: During the nutrition research, the amount of consumed kilocalories per day was measured for 18…

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Q: A study analyzed the body fat percentage of 80 ISU students. The sample mean was 23.70 and the…

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Q: In a survey of 1007 parents of children ages 8 to 14, 75% say they are willing to get a second job…

A: Given information- A proportion of parents say they are willing to get a second job or part-time…

Q: A credit counseling agency wants to estimate the mean amount of credit card debt held by Americans.…

A: Here we need to construct a 90% confidence interval for the population mean.

Q: Is narcissism a more common personality trait today than it was a few decades ago?  It is known that…

A: From the provided information, Sample size (n) = 25 Mean (M) = 16.5 Sample standard deviation (s) =…

Q: In a study of woman's bone health, a random sample of 8 women was taken, and their daily calcium…

A:

Q: 700 randomly selected Americans were asked if they believed the minimum wage should be raised. 350…

A: Given that  p = 700 x = 350 Confidence level(c) = 90% = 0.90 Significance level (α) = 1-c = 1-0.90=…

Q: A simple random sample of 5 recently hospitalized migraine sufferers were given a new treatment; the…

A: The degrees of freedom is obtained as follows: Df=n-1    =5-1     =4 The critical-value is obtained…

Q: Reports show that 92% of online searches in March 2021 use Google as the search engine. A network…

A: Given: p=0.92 p^ = 758800=0.9475 α = 0.05 to test the hypothesis of proportion of searches that use…

Q: Caffeine is considered the most commonly used psychoactive drug in the world. It is estimated that…

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Q: An ANOVA is used to evaluate the mean differences among three treatment conditions with a sample of…

A: It is given that the number of treatments is 3.Total number of observations is (12 x 3) = 36.

Q: Apple Computer believed that 36 percent of its smartphone customer own the most recent model of…

A: Here we conduct Z test for proportion.

Q: What is a confidence interval in statistics?

A: In inferential statistics, the two types of estimation are: point estimate and confidence interval…

Q: According to a study of 90 truckers, a trucker drives, on average, 560 miles per day.  If the…

A:

Q: What is the minimum required sample size to make a 96% confidence interval for a population mean if…

A: Margin of error=E=2 Standard deviation=σ=12 96% confidence interval  E=Zc×σ/√n n=sample size

Q: Results from the National Health and Nutrition Examination Survey (NHANES) conducted thirty years…

A: Denote p1, p2 as the true population proportions of adults, who considered to be obese thirty years…

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.