A CEO of a large electric utility claims that 90% of his 1,000,000 customers are very satisfied with the service they receive. A local news station wants to check if this claim is accurate. Using simple random sampling they sampled 125 customers and found that 106 were very satisfied. Is there enough evidence to conclude that the CEO’s statement is not accurate at the .05 level? Show all steps of a hypothesis test. (State the hypothesis, calculate the z value, report the pvalue, write the conclusion) I.State the hypotheses. II.Calculate the test statistic. III.Find the p-value. IV.Make a statistical decision. V.State your conclusion in context of the problem.

Q: Test the claim using a hypothesis test.

A: Let We have given a proportion of males and females. so we have to use the proportion of the…

Q: claimed that 3% of professional golfers are left-handed. Believing this claimed value is incorrect,…

A: Given that Level of significance =alpha =0.05 And  P-value =0.01

Q: According to a Pew Research poll conducted in March 2022, 61% of U.S. adults say abortion should be…

A:

Q: A statistics student believes that black cars are less likely to receive tickets for moving…

A: It is given that the P-value is 0.24.

Q: Consider a hypothesis test of the claim that following a particular diet reduces the likelihood of…

A: Here we consider a hypothesis test of the claim that following a particular diet reduces the…

Q: In a major election, a survey with 1000 voters is conducted. It is found that, among them, 450 votes…

A: Sample size = 1000 for both.  X1 = 450  X2 = 410 At 5% level of significanve.   By using two sample…

Q: The p-value for a hypothesis test turns out to be 0.08621. At a 5% level of significance, what is…

A: Decision rule : Reject H0 if P-value  <  α

Q: A data set lists earthquake depths. The summary statistics are n = 400, x = 5.92 km, s=4.67 km. Use…

A: Note: Hi there! Thank you for posting the question. As there are several independent questions,…

Q: Test the claim that the proportion of people who own cats is smaller than 60% at the 0.025…

A:

Q: Perform the following hypothesis test of a proportion: HO: p = 0.125 HA: p 0.125 The sample…

A:

Q: The critical boundaries for a hypothesis test are z = +1.96 and -1.96. If the z-score for the sample…

A: Solution: The critical boundaries for a hypothesis test are z = +1.96 and -1.96. Z test statistic or…

Q: A hypothesis test is conducted with a level of significance of 1% and the resulting p value is…

A:

Q: For a repeated measures study, if the null hypothesis is true, then what value should be obtained…

A: According to the provided information, the null hypothesis is true

Q: According to the study, the average number of hours that the student spent studying per week in the…

A: From the provided information, Mean (µ) = 56 hours Standard deviation (σ) = 14 hours X~N (56, 14)

Q: According to the most recent General Social Survey, 70% of adults watch TV nightly. A researcher…

A:

Q: In a random sample of males, it was found that 29 write with their left hands and 213 do not. In a…

A: Given information, In a study of  random sample of males, it was found that there are 29 write with…

Q: In a random sample of males, it was found that 22 write with their left hands and 220 do not. In a…

A:

Q: A newsletter publisher believes that over 33% of their readers own a laptop. For marketing purposes,…

A: Given that  Claim: Over 33% of their readers own a laptop.  Decision : Reject the null hypothesis.

Q: Based on this information, which one of the following statements is correct?                If a…

A: We have given that  Claim: The true population proportion of adults who favour the colour purple is…

Q: Use the one-proportion z-test to perform the required hypothesis test. In a clinical study of an…

A:

Q: A researcher is testing the effect preschool has on the development of young children mothers more…

A:

Q: In a random sample of males, it was found that 22 write with their left hands and 209 do not. In a…

A: Given that,sample one, x1 =22, n1 =(22+209) = 231, p1= x1/n1=0.0952sample two, x2 =67, n2 =(67+469)…

Q: e data to test for independence between Gender and Full or Part-time status. Use a 5% level of…

A:

Q: The p-value for a hypothesis test turns out to be 0.05949. At a 9% level of significance, what is…

A: P-value=0.05949and α=0.09

Q: A newsletter publisher believes that less than 32% of their readers own a laptop. For marketing…

A: Decision : Reject the null hypothesis.

Q: A data set includes data from student evaluations of courses. The summary statistics are n= 90, x=…

A:

Q: In a random sample of males, it was found that 25 write with their left hands and 217 do not. In a…

A: There are two independent samples which are males and females. We have to test whether the rate of…

Q: What type of error is possible in this situation?

A: A 2011 survey, by the Bureau of Labor Statistics, reported that 91% of Americans have paid leave. In…

Q: Lemis Sweets Company (LSC) makes a special candy called HAPPYGR company claims that 30% of HAPPYGROW…

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

Q: The p-value for a hypothesis test turns out to be 0.06787. At a 6% level of significance, what is…

A: It is given that,  The p-value for a hypothesis test turns out to be 0.06787 i.e. P-value= 0.06787…

Q: According to the most recent General Social Survey, 70% of adults watch TV nightly. A researcher…

A: n=400, p=70% , x=276

Q: You are hired by a university health services department to examine the relationship between flu…

A:

Q: unions. At the 10% significance level, do the data provide sufficient evidence to conclude that the…

A:

Q: A publisher reports that 46% of their readers own a Jaguar. A marketing executive wants to test the…

A: Given,sample size(n)=220sample proportion(p^)=0.50α=0.05H0:p=0.46H1:p>0.46

Q: The p-value for a hypothesis test turns out to be 0.05015. At a 2% level of significance, what is…

A: From the provided information, The p value for a hypothesis test = 0.05015 Level of significance (α)…

Q: Suppose 245 subjects are treated with a drug that is used to treat pain and 50 of them developed…

A:

Q: Failing to reject an invalid null hypothesis (continuing to incorrectly assume a null is valid) is…

A: Option A) is correct. The beta-risk

Q: USA Today reported that about 47% of the general consumer population in the United States is loyal…

A: We have given that the hypothetical proportion p0=0.47, sample size 1002 and favourable cases X =…

Q: In a study of 810 randomly selected medical malpractice lawsuits, it was found that 499 of them were…

A:

Q: What hypothesis testing procedure should you use to answer these questions? 0.05 if it isn't Assume…

A: Given that  Sample sizes n1=2000 , n2=2000 Sample proportion p1^=0.247 , p2^=0.287

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.