An article in the Washington Post on March 16, 1993 stated that nearly 45 percent of all Americans have brown eyes. A random sample of n = 55 PCC students found 22 with brown eyes. Give the numerical value of the statistic p. =

Q: Is the mean age at which American children can first read now under 4 years? If the population of…

A: Hypothesis Testing: Hypothesis is a procedure by which we can tests an assumption regarding a…

Q: 21% of deaths among male adults can be attributed to heart diseases. Is this percentage different…

A: Given that : 21% of deaths among male adults can be attributed to heart diseases. Is this percentage…

Q: in a college, 15% of the students participate in social activities at least twice a  month. A…

A:

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: A food service director for a national corporation suspects that people are more likely to order…

A: a) Null Hypothesis: H0: The salad sales are not uniformly distributed across the days of the week.…

Q: a. Out of a random sample of 74 birds, how.many would you expect to live longer than 9 years? b.…

A: Let X = number of years a bird lives.  Then, X ~ Exponential (0.125) Thus,  f(x) = 0.125e-0.125x .

Q: Jump to level 1 software company is interested in improving customer satisfaction rate from the 76%…

A: Given data, p=76% =0.76 n=230 x=183 Sample proportion is   Test Statistic z=?

Q: In order to investigate the relationship between mean job tenure in years among workers who have a…

A: Given information: Workers with bachelor's degrees: n1=155X¯1=5.2 yearss1=1.3 years Workers with no…

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: Is the difference between the mean annual salaries of statisticians in Region 1 and Region 2 more…

A:

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

A: It is given that x=176, n=267 and P=0.61.

Q: The U.S. Census Bureau reported that in 2015 the proportion of adult Americans, ages 25 and older,…

A: a) Assume that p is population proportion of adult Americans, ages 25 and older, who have a…

Q: A new insecticide is advertised to kill more than 95% roaches upon contact.  In a laboratory test,…

A: The random variable roach upon contact follows binomial distribution. X ~ B (n, p). We have to use…

Q: A simple random sample of 28 observations was taken from a large population. The sample mean equaled…

A: It is given that, a simple random sample of 28 observations was taken from a large population with…

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

A:

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: A random sample of 260 workers in a high rise office building revealed that 30% were very satisfied…

A: Let the proportion of workers who are satisfied with the quality of work be p^ p^ = 0.30 (point…

Q: Data from the Department of Motor Vehicles indicate that 80% of all licensed drivers are older than…

A: Population proportion = 0.8 The proportion of licensed drivers older than age 25  = 33/50 = 0.66…

Q: A sample of n = 9 men are asked." what is the fastest you have ever driven a car?" The sample mean…

A: Given: n=9

Q: A sample of n = 25 scores is selected from a population with μ = 70 and σ = 20. It is very unlikely…

A: Distribution of the Sample Mean: If the distribution of the population has mean μ and standard…

Q: Among the first-year resident students, eight students were randomly selected, and their body…

A: Given: weight at the beginning of the semester (X) End of term weight (Y) 45 52 61 65 62 64…

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: Is the difference between the mean annual salaries of statisticians in Region 1 and Region 2 more…

A: Null hypothesis H0:  The difference between mean salaries of statisticians in two regions  is $8000…

Q: The U.S. Census Bureau reported that in 2015 the proportion of adult Americans, ages 25 and older,…

A: a) Consider that p is population proportion of adult Americans, ages 25 and older, who have a…

Q: According to a 2015 article, 37% of Americans aged 25 years or older have been arrested. An Orange…

A: Given that sample size n = 120 Number of persons who have been arrested, X = 48 Level of…

Q: The police chief selects a sample of 49 local police officers from a population of officers with a…

A: Given n=49, x̄=74, μ=72, σ=7 , ɑ=0.05  Test the hypothesis at ɑ=0.05

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: 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: A sample of size 40 provided a test statistict = -1.6. Use a = 0.10. The conclusion is:

A:

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

A:

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

A:

Q: Which of the following is the obtained chi-squared statistic for this test?

A: Test is that whether the ethnic composition of the students in the university has changed.

Q: A study is run to estimate the association between exposure to lead paint in childhood and…

A: Given data of exposure to lead paint in childhood  and attention deficit hyperactivity disirder.…

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: A simple random sample of 100 high school students who took the AP exam in statistics is taken from…

A: Solution:- from given information Null hypothesis H0:p1=0.4,p2=0.25,p3=0.23,p4=0.12Alternate…

Q: Consider a population with variance 41 and mean 1. What is the z-score for a the value x = 20? Round…

A: Given: Variance= 41 Mean =1 To find: z-score for the value x=20

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: 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: The police chief selects a sample of 49 local police officers from a population of officers with a…

A:

Q: The Substance Abuse and Mental Health Services Administration (SAMHSA, 2017) estimates that 10.9% of…

A: The value of p is 0.109.

Q: Listed below are brain volumes, in cm³, of a simple random sample of unrelated subjects. Does it…

A: Compute the average and standard deviation of the sample and compute the t-statistics to test…

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: A random sample of 50 pieces of candy from a bag of assorted types is examined. Which of the…

A:

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

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

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.