A software company is interested in improving customer satisfaction rate from the 61% currently claimed. The company sponsored a survey of 221 customers and found that 144 customers were satisfied.   What is the test statistic z?_______

Q: Sale amounts during lunch hour at a local subway are normally distributed, with a mean $7.56, and a…

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Q: Please find the five-number summary and draw the box plot for the following data set: (Min Q1 M Q3…

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Q: Claim: >80; x = 0.01 Sample statistics: x=81.1, s= 3.1, n = 25

A: The claim is μ>80;α=0.01x=81.1s=3.1n=25

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A: Given: sample size n = 30 Formula Used: Slope b = n∑XY-∑X∑Yn∑X2-∑X2 Intercept a = ∑Y-b∑Xn…

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Q: According to a report done by S & J Power, the mean lifetime of the light bulbs it manufactures is…

A: 1. The provided information is  n=20x¯=45σ=7α=0.01The null and alternative hypothesis is…

Q: In a survey, 29 people were asked how much they spent on their child's last birthday gift. The…

A: Givensample size(n)=29Mean(x)=35standard deviation(s)=15confidence level=90%

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Q: Suppose that the duration of a particular type of criminal trial is known to be normally distributed…

A: Given Mean=16 Standard deviations = 5

Q: One survey showed that among 850 randomly selected subjects who completed four years of college, 125…

A: Given,n=800x=125population proportion(P)=0.18α=0.01

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Q: Table 3.2 lists the total philanthropic givings (in million dollars) by six companies during 2007.…

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Q: You wish to test the following claim (HaHa) at a significance level of α=0.05α=0.05.…

A: Hypothesis test are used to measure the significance between the sample and population. There are…

Q: Private nonprofit four-year colleges charge, on average, $26,508 per year in tuition and fees. The…

A: Given data: Mean = $ 26508 Standard deviation  = $6881

Q: A washing machine manufacturer advertises that the median life of the machines is at least 8 years.…

A: Given  Total number of machines =n=20 12 machines lasted less than 8 years  8 machines lasted more…

Q: If a hypothesis test using a sample of n = 16 scores produces a t statistic of t = 2.15, then the…

A: Given:             Sample Size = n = 16              t statistic of t = 2.15…

Q: Let X denote the number of times a certain numerical control machine will malfunction: 1, 2, or 3…

A: Given  f(x,y) y 1 2 3 Total x 1 0.10 0.05 0.02 0.17 2 0.10 0.35 0.05 0.50 3 0.03 0.10…

Q: 2. For the following information on a data set: Measurement Class .00- .75 .75-1.50 1.50-2.25…

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Q: Which of the following is not a measure of central tendency, i.e. the middle of a data set? Mean…

A: Descriptive statistics: Descriptive statistics refers to data interpretation which facilitates…

Q: An insurance policy sells for $600. Based on past data, an average of 1 in 50 policyholders will…

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Q: 2. Let X denote the reaction time, in seconds, to a certain stimulus and Y denote the temperature…

A: Let X:the reaction time Y:the temperature Let X and Y have joint pdf f(x, y) =1.5(x2 + y2 )…

Q: Question 7 ▼ The amount of coffee that people drink per day is normally distributed with a mean of…

A: Let X be the random variable from normal distribution with mean (μ) = 16, standard deviation (σ) = 5…

Q: Private nonprofit four-year colleges charge, on average, $27,647 per year in tuition and fees. The…

A: Given that.   X~N( μ , ?^2 )   μ= 27647    , ?=7041   Z-score =( x - μ )/?

Q: In the General Social Survey, respondents were asked "If your party nominated a woman for President,…

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Q: The accompanying data show the number of bacteria present after a certain number of hours. Find the…

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Q: Twenty machines produce pistons. A random sample of 10 pistons is taken from machine (for a total…

A: Cluster sampling  :  The population is divide into clusters (groups ) and randomly cluster is…

Q: ected identical parts eries cannot functio ectronic produc che parts fail. When the life span of…

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Q: Suppose you are testing Hoμ = 94 against Ha: μ< 94. From an SRS of 68 individuals, you compute X =…

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Q: In order to study the average number of continuous push-ups that his students can perform, a…

A: Given information, In order to study the average number of continuous push-ups that his students can…

Q: The mean daily production of a herd of cows is assumed to be normally distributed with a mean of 39…

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Q: ngineers must consider the breadths of male heads when designing helmets. The company researchers…

A: Given: mean(μ)=5.8standard deviation(σ)=1

Q: When people smoke, the nicotine they absorb is converted to cotinine, which can be measured. A…

A: Given Mean=136.8 Standard deviations=107.5 Sample size=65

Q: A random sample of 20 recent weddings in a country yielded a mean wedding cost of $26,396.48. Assume…

A: The answer is attached below,

Q: School X School Y 1. 3. Number of Years Teachers Have Been Teaching 5. 7. 2 4 6 8 What is the median…

A: The comparative boxplot is employed to contrast different collections of information pertaining to…

Q: Consider the data set (5,6,-4,5,3,2,0,3,6} a) Find the average A of the data set. Round your answer…

A: From the provided information, The data set is as follow: {5, 6, -4, 5, 3, 2, 0, 3, 6}

Q: Based on the following payoff table, answer the following: Buy Rent A) 69. B) 57. C) 90. Lease Prior…

A: The following payoff table is given: Alternative  High Low Buy 90 -10 Rent 70 40 Lease 60…

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 4.9…

A: Given,mean(μ)=4.9  yearsstandard deviation(σ)=1.2  years

Q: What is the probability that the sample proportion is between 0.3 and 0.42?

A: HERE GIVEN ,  Based on historical data, your manager believes that 35% of the company's orders come…

Q: USE SALT hat is the level of significance? the null and alternate hypotheses. Ho: P 0.82; H₁: P =…

A: Level of significance = 0.01 Hypothesized Population Proportion (P0)=0.82 Favorable Cases (X) =54…

Q: actually 0.25 (we normally wouldn’t know this, but suppose hypothetically someone was able to know…

A: The total number of exposed and non-exposed  in the source population   Cases Controls Exposed…

Q: item test. The standard deviation of the eviation of the sample is 10. Construct a 95% confidence…

A: Given data,No of students n=22The mean is x=60The sample sd is s=10Construct a 95% CI?

Q: Twenty-one students were asked at random how much they spent for classroom textbooks this semester.…

A: Given,margin of error(E)=7standard deviation(s)=28.70α=1-0.90=0.1α2=0.05Z0.05=1.645      (from…

Q: A researcher reports that the average income of system analysts in Makati is P44,000 per month. A…

A: Given: Average(μ)=44000sample size(n)=30Sample mean(x¯)=45800Standard deviaion(s)=5400

Q: in the 1980s, Tennessee conducted an experiment in which kindergarten students are randomly assigned…

A: Regression explain there is any relationship between the independent and dependent variable.…

Q: A car leasing firm's records indicate that the mean number of miles driven annually in its cars has…

A: GivenA car leasing firm's records indicate that the mean number of miles driven annually in its cars…

Q: 2 3 4 6 7 11 20 33 Use the table of expected z-scores (rounded to the nearest tenth) below to…

A: Given: 2 3 4 6 7 11 20 33

Q: Suppose that you are working for a chain restaurant and wish to design a promotion to disabuse the…

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Q: The following sample data are from a normal population: 15, 11, 30, 19, 22, 25, 33 28, and 36.…

A: Given that sample data from normal population 15,11,30,19,22,25,33,28,36 . It is required to find…