A Harriss poll taken surveyed 2016 adults and found that 423 of them had one or more tattoos. can you conclude that the percentage of adults who have a tattoo is less than 25%? Use the a=0.01 level of significance.

Q: A report from the Center for Science in the Public Interest-a consumer group based in Washington,…

A:

Q: A researcher is analyzing data from a repeated-measures research study. If the researcher ran a…

A: The difference is, Subject 1st 2nd Difference #1 10 11 -1 #2 4 6 -2 #3 7 9 -2 #4 6 5 1…

Q: Based on the Nielsen ratings,the local CBS affiliate claims its 11 PM newcast reaches 41% of the…

A: Given Information: Based on the Nielsen ratings,the local CBS affiliate claims its 11 PM new cast…

Q: an you conclude that the percentage of people aged 18-29 who have a tattoo is less than 25%

A: Given : n=830 , X=166 , p0=0.25 , α=0.01 The estimate of the sample proportion is ,…

Q: A researcher found that a 95% confidence interval for the mean hours per week spent studying by…

A: The 95% confidence interval is given by (13,17)

Q: 2. Use the first 30 data values in Table 1. Test, at the 5 percent level of significance, the…

A: For mean cholesterol, The hypothesis to be tested is- H0:μmen=μwomen H1: μmen≠μwomen This is a…

Q: A software company is interested in improving customer satisfaction rate from the 80% currently…

A: The Null and Alternative Hypotheses is given by: H0: p0=0.80 H1: p0≠ 0.80 The sample proportion is…

Q: Putra College surveyed its students to determine the average weekly time spent surfing the internet.…

A: Population in the set of all outcomes of interest in a study. In real life scenarios studying the…

Q: A survey of 100 fatal accidents showed that in 43 cases the driver at fault was inadequately…

A: We have given that , A survey of 100 fatal accidents showed that in 43 cases the driver at fault was…

Q: The IQ scores of children in a special education class are normally distributed with μ = 95 and σ =…

A:

Q: It is thought that 12% of all students taking a particular course received a grade of A. In a sample…

A:

Q: A software company is interested in improving customer satisfaction rate from the 66% currently…

A: From the provided information, A software company is interested in improving customer satisfaction…

Q: A software company is interested in improving customer satisfaction rate from the 61% currently…

A: Given data A software company is interested in improving customer satisfaction rate from 61%…

Q: In 2018, the General Social Survey asked a random sample of 1,414 adults "Have you ever been told…

A: a. A random sample of 1,414 adults are taken for a survey to ask question 'Have you ever been told…

Q: A research article stated that there was a mean difference in depressive symptoms between male and…

A: From the provided information, The claim is that there was a mean difference in depressive symptoms…

Q: Samuel Morse determined that the percentage of a's in the English language in the 1800s was 8%. A…

A: Denote p as the true proportion of a’s in modern newspaper. It is reported that proportion of a’s in…

Q: A software company is interested in improving customer satisfaction rate from the 50% currently…

A: The null and alternative hypothesis is defined as:

Q: A company claims that 90% of its deliveries arrive on time. You take a sample of 74 deliveries, of…

A: Given,   The sample proportion is,

Q: compared to the median, the mean number of hours that participants watch television is ___.  -lower…

A: The given Statistic is :

Q: You have been hired by a consortium of local car dealers to conduct a survey about the purchases of…

A: Given: Confidence level = 95% Margin of error = 0.03 Formula Used: n = ZαMargin of error2 p(1-p)

Q: A sample of people attending a professional football game averages 13.7 years of formal education.…

A: Given information: A sample of people attending a professional football game averagesX¯=13.7 The…

Q: in a gallup poll of randomly selected adults, 66% said that they worry about identity theft.  For a…

A: Given,         sample size(n) =1013    The probability of an adults said that     They worry about…

Q: Given this data and the R2 value being R2 = 0.446   How can you interpret the results of this…

A: The R2 is known as the coefficient of determination, The R2 measures how much variation in the…

Q: A software company is interested in improving customer satisfaction rate from the 75% currently…

A: Hypotheses: The null and the alternative hypotheses are, H0:p=0.75H1:p>0.75

Q: It has been claimed that over 30 percent of entering college students have blood cholesterol levels…

A: The appropriate test for the given claim is one sample t test over the hypothesis, H0 : μ≥200 Ha ;…

Q: A software company is interested in improving customer satisfaction rate from the 62% currently…

A: Population proportion is 0.62 Sample proportion is 90/135 =0.6667

Q: The test scores for a class of 155 students are computed. What is the location of the test score…

A: Given that  The test scores for a class of 155 students are computed n=155 Find the location of the…

Q: A report from the Center for Science in the Public Interest-a consumer group based in Washington,…

A: Solve

Q: A software company is interested in improving customer satisfaction rate from the 55% currently…

A:

Q: According to the 2005-2006 National Pet Owners Survey, only 16% of dogs were adopted from an animal…

A:

Q: A Chinese cell-phone manufacturer exclusively uses robots in one of its factories. A random test run…

A:

Q: Forbes reports that women trust recommendations from Pinterest more than recommendations from any…

A: It is given that the number of women trust recommendations made on Pinterest (x1) is 117, number of…

Q: Only about 10% of all people can wiggle their ears. Is this percent different for millionaires? Of…

A: Here use single proportion z test Only about 10% of all people can wiggle their ears. Is this…

Q: What is the z-score of the 31st percentile?

A: The z-score for the 31st percentile is the value such that 31% of the area under the standard normal…

Q: In spss, what test can you do to compare the score of variables?

A: As per the question we have to compare the score of variables if we have 2 independent samples, we…

Q: A software company is interested in improving customer satisfaction rate from the 75% currently…

A:

Q: What is the value of the correlation coefficient r across the entire data set (all 10 students)?

A: INTRODUCTION :   CORRELATION:  In a bivariate distribution, we may be interested to find out if…

Q: The test scores for a class of 203 students are computed. What is the location of the test score…

A: Third quartile is above 75% of the observations.

Q: 2) Estimate the difference between the ages of male and female respondents with 95% confidence.

A: Given information:   Female Male Mean 47.15625 44.16667 Sum 1509 795 S.D 14.14923 19.87979…

Q: You are planning a cross-sectional study of the impact of chocolate milk shake drinking on obesity…

A: Sensitivity and Specificity: While measuring the effect of any given factor on a particular disease,…

Q: Sixteen out of 35 high school seniors ran the mile in less than 6.25 minutes. At a=0.01, is there…

A: Solution: Give Total =60 X+ =35 remaing. X-=25 The test statistic is X = \min\{X^+, X^-\} =…

Q: A software company is interested in improving customer satisfaction rate from the 55% currently…

A: The following information is provided: The sample size is N=247N = 247, the number of favorable…

Q: How many Biology students’ records need to be sampled to estimate the percentage who earn "A"s to…

A: The proportion is not provided therefore in worst case it can be assume as (p) 0.5. Margin of error…

Q: A software company is interested in improving customer satisfaction rate from the 75% currently…

A: From the given information, Consider, x be the random variable that shows the customer satisfaction…

Q: The recidivism rate for convicted sex offenders is 11%. A warden suspects that this percent is…

A:

Q: A software company is interested in improving customer satisfaction rate from the 54% currently…

A: Given, A software company is interested in improving customer satisfaction rate from the 54%…

Q: A software company is interested in improving customer satisfaction rate from the 61% currently…

A: Given,sample size(n)=107no.of customers were satisfied (X)=73population proportion(P)=0.61

Q: A clinical psychologist took a sample of four people from the population of people with anxiety…

A:

Q: In a class of 31 students, how many would be above the third quartile?

A: From the above data  Sample size n=31 How  many would be above the third quartile?

Q: A software company is interested in improving customer satisfaction rate from the 65% currently…

A: From the provided information, A software company is interested in improving customer satisfaction…

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.