At a factory that produces switches, a batch of 4000 switches has just been produced. To check the quality of the switches, a random sample of 175 switches is selected to test for defects. Of these 175 switches, nine were found to be defective. Based on these results, what is the best estimate you can give for the number of defective switches in the batch of 4000? Show detailed work.

Q: A research group conducted an extensive survey of 3052 wage and salaried workers on issues ranging…

A: Find z-critical value:…

Q: The sales rep of a waterbed claims that 25% of the Filipino died because of cardiovascular diseases.…

A:

Q: Last year, television station WXYZ's share of the 11 P.M. news audience was approximately equal to,…

A: Introduction :-  Given :-  Surveyed a random sample of 400 11PM news viewers and found that 146…

Q: In 2000, 58% of females aged 15 and older lived alone, according to the U.S. Census      Bureau. A…

A: State the hypotheses. That is, there is no sufficient evidence to conclude that proportion has…

Q: A sociologist wants to know the proportion of adults with children under the age of 18 that eat…

A:

Q: In a random sample of 76 people, 38 are classified as​ "successful."   a. Determine the sample​…

A: Given that in a random sample of 76 people, 38 are classified as​ "successful."  a) The sample​…

Q: A marketing company is trying out 4 different commercial advertisements and want to test which one…

A: Null Hypothesis: H0: The means of the four commercial groups are same. Alternative Hypothesis: H1:…

Q: A group of 400 randomly and independently selected cats were selected from a shelter to place in…

A: Given X=378 n=400

Q: You take a random sample of size 25 students and find the 5 who understand this lecture. With 99%…

A:

Q: delivery rate for 2010 was about 32.8%. Cesarean delivery is also called a “C-section.” It means the…

A:

Q: A researcher claims that the incidence of a certain type of cancer is less than 5%. To test his…

A: In this context, a researcher claimed that the proportion of incidence of particular type of cancer…

Q: You read an online article that claims that 62% of 8-year-olds have social media accounts.  You want…

A: Solution: From the given information, the probability of 8-year-olds have social media accounts is…

Q: A newspaper article claims that 92 percent of teens use social media. To investigate the claim, a…

A: Conditions to use a one sample proportion z test: Conditions to use a one sample proportion z test :…

Q: A researcher conducts an experiment comparing four treatment condition with n=12 scores in each…

A: Independent measures ANOVA: In this case there are 4 treatment conditions where each treatment…

Q: A research group conducted an extensive survey of 3056 wage and salaried workers on issues ranging…

A: From the given information, the confidence level is 95%. The margin of error is 1.5% or 0.015. From…

Q: Twenty-five samples of 100 items each were inspected when a process was consideredto be operating…

A: The given information is that twenty-five samples of 100 times are inspected. In the 25 samples, the…

Q: For a sample of 9 with a mean of 5994. How would i find the EX?

A:

Q: Fifty people are selected randomly from a certain population and it is found that 12 people in the…

A: From the given information, There are 50 people and 12 people in the sample are over six feet tall.…

Q: According to a recent poll, 53% of Americans would vote for the incumbent president. If a random…

A: Null hypothesis : H0 : μ = 0.53 Alternative hypothesis : Ha : μ ≠0.53 It is two tailed test.

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: To determine if there is a significant difference in the proportion of smokers among the blue collar…

A:

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: What is the point estimate of the true proportion of people in the population who are over 6 feet…

A: Given that, Sample of 50 peoples is to be drawn and out of which 14 are possessing  characteristic…

Q: A researcher measures eye color for a sample of n = 50 people.  Which measure of central tendency…

A:

Q: At a certain college, it is estimated that at most 35% of the students ride bicycles to class. At…

A: given p =0.35 random sample 90 ride bicycles to class x = 28 p⏞ =2890=0.3111

Q: A poll in one country indicated that 48​% favor imposing the death penalty​ (the country currently…

A: Sample Size:The formula for the sample size is as follows:

Q: A company claims that only 4% of their products are defective. A random sample of 320 products is…

A: Given information- We have given that a company claims that only 4% of their products are defective.…

Q: A researcher selects all of the possible samples with n = 8 scores from a population and computes…

A: The mean of the sampling distribution of the sample mean is an unbiased estimator for population…

Q: Has the law that mandates the use of bicycle helmets failed? The National Cycling Association wants…

A: Dear students as per guidelines we answer the first three subparts only. Solution To find confidence…

Q: A study is to be made to estimate the proportion of residents of a certain city and its suburbs who…

A: Given: Margin of Error ME= 0.06 Confidence level c= 0.90

Q: If the percentage of defective in a factory was 0.30, a random sample of 200 units was taken, and 50…

A: Let X be a random variable which denotes the number of defective units. p=0.3n=200X~Bin(n,p) The…

Q: The National Association of Home Builders reported that 57 % of young people ages 18-24 wereliving…

A: According to the provided information, 57% (p) of young people ages 18-24 were living with their…

Q: In a random sample for 56 professional actors, it was found that 46 were extrovert.let p represent…

A: Given that in a random sample for 56 professional actors, it was found that 46 were extrovert. i.e.…

Q: A state highway patrol official wishes to estimate the number of  legally intoxicated    drivers on…

A: It is given that margin of error (E) is 0.05 and the confidence level is 0.99.

Q: A pollster wishes to estimate, with 95% confidence, the proportion of people who believe that recent…

A: a) Assume p-hat as 0.5, since no preliminary estimate is available.

Q: On my trip to Ireland, I became fascinated with the problem of counting "carrots"; I have never seen…

A:

Q: In a sample of 88 children selected from a city, 8 children suffer from asthma. What is the P-value…

A: Statistical hypothesis testing is an important method in inferential statistics. Statistical tests…

Q: The percent of the population that is left-handed has historically been 10%. In a random sample of…

A: Solution: State the hypotheses Null hypothesis: That is, the per cent of the population that is…

Q: According to the Rule of Three, when we have a sample size n with x=0 successes, we have 95%…

A:

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

A: First, we obtain 20 random numbers between 1 and 57 using the function "RANDBETWEEN()" function in…

Q: A marine biologist wants to estimate the average weight of a population of dolphins living in a…

A: Note: the options for the answers are not given. So, the answer is written in assumption. In order…

Q: A newspaper article claims that 92 percent of teens use social media. To investigate the claim, a…

A: Ans : The distribution of the population is not approximately normal.

Q: A study is to be made to estimate the proportion of residents of a certain city and its suburbs who…

A: From the given information, Margin error (E) = 0.03 Assume sample proportion = 0.5   The objective…

Q: 4. At CPU, it is estimated that fewer than 25% of the students have cars on campus Does this seem to…

A: Statistical hypothesis testing is an important method in inferential statistics. It is used to test…

Q: In a previous​ poll, 43​% of adults with children under the age of 18 reported that their family ate…

A: It is given that the hypothesized population proportion (p) is 0.43 and the sample size is 1145 and…

Q: At a certain college, it is estimated that fewer than 25% of the students have cars on campus. Does…

A: Given that,  H0: p= 0.25  H1: p=! 0.25 Sample size is n= 90 And x= 28 Proportion, P= x/n  = 28/90…

Q: You read an online article that claims that 62% of 8-year-olds have social media accounts. You want…

A: Here n = 130 and p = 62% = 0.62

Q: Fifty people are selected randomly from a certain population and it is found that 12 people in the…

A: Sample size = n = 50 Sample number of events = x = 12 Sample proportion = p̂ = x/n = (12/50) =…

Q: Because of the popularity of movies as an entertainment medium for college students, you plan to do…

A: Solution: Given information: Population standard deviation= σ= $0.50   Margin of error = E= $0.25…

Q: The Nero Match Company sells matchboxes that are supposed to have an average of 40 matches per box,…

A: From the given information,   Here, the sample mean, x-bar is 42.8. Population mean, µ is 40.…

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.