lifespan of smart-phone battery. A sample of 105 batteries was taken and a 90% confidence interval was computed. However, you found out that data contained one extremely low value (outlier). Which of the following will be true if you remove the outlier and recomputed the interval? I. The interval will be narrower. II. The center of the interval will decrease. III. The margin of error will decrease. a. I only b. I and II only c. II only d. I and III only e. I, II, and

Q: You collect a random sample of 50 children and compute X¯X¯ , the average height in inches. The…

A: Given Data : Sample Size, n = 50.0 Sample Mean, x̄ = 47.5 standard…

Q: 1. The mean and standard deviation for the quality grade point averages of a random sample of 36…

A: "Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: Greece has faced a severe economic crisis since the end of 2009. A Gallup poll surveyed 1,000…

A:

Q: A sample of 200 corporate managers produced the mean job-related stress score of 7.9 with a standard…

A: It is given that,

Q: Refer to the following scenario. Ah epidemiologist is worned about the prevalence of the flu in…

A: Givenx=39n=334p^=xn=39334=0.116766Margin of error(E)=0.05Confidence…

Q: 1. Your colleague collected a sample of data regarding the mean length of a movie and they computed…

A: It has been given that the confidence interval of the mean length of a movie has been computed on a…

Q: The 2010 General Social Survey asked the question: “After an average work day, about how many hours…

A: a) There is 95% confidence that the proportion of number of hours spent relaxing or pursuing…

Q: 1. A city health department wishes to determine if the mean bacteria count per unit volume of water…

A: "Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: A sample of 14 commuters in Cebu showed the average of the commuting times was 33.2 minutes. If the…

A: GivenSample size (n) = 14SD(s) = 8.3 minutesaverage (x) = 33.2 minutes 95% confidence interval.…

Q: Suppose that you intend to find a 95% confidence interval for a population mean by applying the…

A: The z value at 95% confidence level from the standard normal table is 1.96.Let σ is the population…

Q: Which of the following statements best describes the % confidence that the sample intervals in…

A: It can be observed that 10 samples are taken from the population and confidence interval are formed…

Q: . If she wants to make a 95% confidence interval for the mean with the margin of error of 5 cm, at…

A: here from given information , σ = 17 cm MOE = 5cm here Z-critical for 95 % confidence level = 1.96…

Q: Suppose you survey a random sample from a large population to understand the population proportion.…

A: Given information- Margin of error, E = 6% = 0.06 Confidence level, c = 98% Since nothing is known…

Q: Suppose that we want to conduct a 90% confidence test about whether the most recent marketing budget…

A: Given, Suppose we want to conduct a 90% confidence test about whether the most recent marketing…

Q: In a four-year psychedelic-mushroom experiment, 93 of the 300 subjects reported experiencing “strong…

A: Given information- We have given that 93 of the 300 subjects reported experiencing “strong or…

Q: Suppose that you had collected the following sample data (in inches) on the diameters of tree…

A: Given that you had collected the following sample data (in inches) on the diameters of tree trunks,…

Q: Suppose you calculate a 95% confidence interval for a proportion to to be: 0.39 to 0.78. Determine…

A: Given,   Lower bound = 0.39​ Upper bound = 0.78   Here, we use to determine the margin of error.

Q: In order to estimate the percentage of adults who file their taxes at least two weeks before the…

A:

Q: In a random sample of 80 teenagers, the average number of texts handled in a day is 50. The 96%…

A: Given information: n = 80 μ=50 96% confidence interval for the mean number of texts handled by teens…

Q: According to Dietary Goals for the US (1977), high sodium intake may be related to ulcers, stomach…

A: We have given that  Sample size n =9 Sample mean =214 Standard deviation =7.5

Q: 1) In an effort to estimate the mean amount spent per customer at Oliver's Eatery in Astoria,…

A: As per the honor code, We’ll answer the first question since the exact one wasn’t specified. Please…

Q: he AC breakdown voltage of an insulating liquid indicates its dielectric strength. The following are…

A: Obtain the 95% confidence interval for the true average breakdown voltage. The 95% confidence…

Q: A psychologist is studying the effects of lack of sleep on the performance of various…

A: We have to find out answer of given question....

Q: Market research indicates that a new product has the potential to make the company an additional…

A: It is given that,Sample mean = $3.8 million.Sample standard deviation, s is $1.8 million.The sample…

Q: Ten years after graduation, the salaries of Heriot-Watt University graduates are Normally…

A: Let X ~ Normal( 55000, 11000)

Q: Suppose that you wanted to estimate the population mean amount spent eating out per week by…

A: The question is about sample size estimation Given: Sample std. deviation = 200 dollars Margin of…

Q: A quality control expert at a pretzel factory took a random sample of 10 bags from a production run…

A:

Q: 3. A psychologist is studying the effects of lack of sleep on the performance of various…

A: The following information has been provided: x¯=1.82n=36s=0.22 The level of significance is:…

Q: 3- A previous analysis of paper boxes showed that the standard deviation of their lengths is 9…

A: Given;  96% confidence level standard & deviations of length of paper box is given =9mm with…

Q: In a study of government financial aid for college students, it becomes necessary to estimate the…

A: We have to find out given sample size..

Q: Solve the problem. How much money does the average professional football fan spend on food at a…

A: Given,sample size(n)=10sample mean(x¯)=$70standard deviation(s)=$17.50α=1-0.95=0.05α2=0.025degrees…

Q: An economist is interested in studying the incomes of consumers in a particular country. The…

A: The population standard deviation = $1,000.Z value for 90% confidence interval is 1.645.Sample size…

Q: If X̅ = 65, ? = 20 ??? ? = 36, construct a 95% confidence interval estimate for the population mean,…

A:

Q: If the sample mean is 70 and the standard error of the sample mean is 8, what will be the 90%…

A:

Q: A psychologist is studying the effects of lack of sleep on the performance of various…

A: We have to find ci for given data.

Q: A health professional takes the temperatures of 5 patients:   99.8    98.3    96.9    98.0    98.3…

A: We have given that  A health professional takes the temperatures of 5 patients: 99.8    98.3    96.9…

Q: If a class took an exam and scored a mean of 82 with a standard deviation of 12, what would be the…

A: Given, Mean(x)=82Standard Deviation(s)=12

Q: (c) A 99% confidence interval from a sample size of 27 observations. 3.054

A: It is given that the sample size is 27 and the confidence level is 0.99.

Q: Which of the following would we not be able to compute a confidence interval for? A population…

A: Answer - Which of the following would we not be able to compute a confidence interval

Q: (a) Does the size of the orifice affect the mean percentage of radon released? Use a =0.05. (b) Find…

A: Here the mean and variance of various groups orifice diameter are SUMMARY       Groups Count…

Q: According to Dietary Goals for the US (1977), high sodium intake may be related to ulcers, stomach…

A: We have given that, Mean(x̄) = 238, standard deviation (s) = 8.3, sample size (n) = 9 and confidence…

Q: In a study of the use of hypnosis to relieve pain, sensory ratings were measured for 8 subjects and…

A:

Q: Suppose we know that a confidence interval for a population proportion is (0.105,0.355), with a…

A: Obtain the margin of error. The margin of error is obtained below: Margin of Error: The margin of…

Q: A cell phone company claims that the average time a person spends on their phone is 12.8 hours a…

A: It is given that the average time spent on phone is 12.2 hours per week and standard deviation is…

Q: 1 - In experiments conducted on 27 steel welds, the average of the breaking load was found to be…

A:

Q: A medical researcher treats 400 subjects with high cholesterol using a new drug. After two months of…

A: Given: A medical researcher treats 400 subjects with high cholesterol using a new drug. After two…

Q: A random sample of 24 army recruits has a mean height of 68 inches with a standard deviation of 2.5…

A:

Q: For a fixed sample size, what happens to a confidence interval for u when we increase the level of…

A: Here we need to determine whether the width of the confidence interval becomes narrower or wider…

Q: Refer to the following scenario. An epidemiologist is worried about the prevalence of the flu in…

A: Solution: Given data: simple random sample(n) = 332 x =  40 (have recently had the flu)  95% =…

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.