The means of the two random samples of 1000 and 2000 are 67.5 and 68.0 inches respectively. Can the samples be regarded to have been drawn from the same population of standard deviation 9.5 inches? Test at 5% level of significance. Also write objective, null and alternate hypothesis

Q: Nationally, patients who go to the emergency room wait an average of 5 hours to be admitted into the…

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Q: It is believed that the average grade on an English essay in a particular school system for females…

A: we have given that  n1=12 , xbar1=82 ,s1=3 and n2=8 ,xbar2=76 ,s2=4  mu1=female   ,mu2=male

Q: The weights of fish in a lake are normally distributed with mean 20 lbs and standard deviation 6. If…

A: Mean = 20 Standard deviation = 6 Sample size = 4

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A: From the given information Null Hypothesis: H0: The mean monthly balance of credit card holders is…

Q: breaking strength differs from 1000 pounds,

A: Sample size (n)=100 Mean breaking strength (x¯) = 1050 pounds Standard deviation (σ)  = 200 pounds…

Q: A manufacturer claims that a particular automobile model will get 50 miles per gallon on the…

A: From the provided information, Sample size (n) = 30 Sample mean (x̄) = 49 Standard deviation (σ) =…

Q: BIG Corporation advertises that its light bulbs have a mean lifetime,  μ , of at least  2900  hours.…

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Q: A two-sample t-test for a difference in means will be conducted to investigate whether the average…

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A: Here, the sample mean, x-bar is 48. Population mean, µ is 50. Sample standard deviation, s= 4.…

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A: We have to find hypothesis..

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Q: A somewhat outdated study indicates that the mean number of hours worked per week by software…

A: Given : Population mean=44 Sample mean=39 Standard deviation =3

Q: Previously, an organization reported that teenagers spent 4.5 hours per week, on average, on the…

A: Given Information :  Previously, an organization reported that teenagers spent 4.5 hours per week,…

Q: Suppose that the population standard deviation of student scores is 20. What will be the sample size…

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Q: A 2016 study reported in Science magazine stated that college math teachers scored a mean of 3.4…

A:

Q: A somewhat outdated study indicates that the mean number of hours worked per week by software…

A:

Q: Nationally, patients who go to the emergency room wait an average of 5 hours to be admitted into the…

A: From the provided information, Sample size (n) = 10 Sample mean (x̅) = 8 Standard deviation (s) = 3…

Q: If we have a sample of size 100 from a population of rope with sample mean breaking strength of 960…

A: The claim is that population mean breaking strength differs from 1000 pounds.

Q: State the statistical hypotheses against a population with a mean of 90 for a one-tailed test where…

A: Given: μ=90 The hypotheses for testing the population mean is given bellow: Null hypothesis: H0:…

Q: In 1980, women who were under 50 years old had a mean body weight of 145 pounds, with a standard…

A: Given Population of study - women who were under 50 years Mean, μ = 145 Standard deviation, σ = 20

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Q: You are doing a right-tailed hypothesis test for the mean and have to approximate the standard…

A: It is given that the test is right-tailed. Level of significance is 0.01 Degrees of freedom is 39-1=…

Q: A sample of 900 members is found to have a mean of 3.47 cm. Can it be reasonably regarded as a…

A: Given: n=900x¯=3.47μ=3.23σ=2.31

Q: For a random sample of size 10 from a normal population, the mean is 12.1 and the standard deviation…

A:

Q: BIG Corporation advertises that its light bulbs have a mean lifetime, μ, of 2800 hours. Suppose we…

A: Since we know that Type 1 error is defined as rejecting the null hypothesis H0 when H0 is true  Type…

Q: The administrator at your local hospital states that on weekends the average wait time for emergency…

A: Hey, since there are multiple subparts posted, we will answer first three subparts. If you want any…

Q: If we have a sample of size 100 with sample mean breaking strength of 975 pounds from a population…

A: Hypothesis to be tested: H0:μ=1000H1:μ<1000

Q: If we have a sample of size 100 with sample mean breaking strength of 975 pounds from a population…

A: Solution: Let X be the breaking strength. From the given information, x-bar = 975 pounds, S=200…

Q: An online food delivery service in metro manila claims that the delivery time is not greater than 30…

A: Given :   Population SD (σ) = 3 Sample size (n) = 31 Sample mean (X¯) = 40 Level of significance (α)…

Q: A facilities manager at a university reads in a research report that the mean amount of time spent…

A: Since, we only answer up to 3 sub-parts, we'll answer the first 3. Please resumbit the question and…

Q: The research director for O'Reilly auto part stores claims that two flares they offer have the same…

A: Two samples t test has used.

Q: that should be used for the test?   (b) Suppose that we decide to reject the null hypothesis. What…

A: The type I error is defined as rejecting the null hypothesis when it is true. The type II error is…

Q: If we have a sample of size 100 with sample mean breaking strength of 975 pounds from a population…

A: Given: n=100x¯=975s=200μ0=1000 The significance level is taken as 0.05.

Q: A sample of 150 homes for sale in ABC City showed a mean asking price of $233,000, but the city…

A: Given, Sample size = 150 Sample mean = 233000 Population standard deviation = 11000   Under the…

Q: Suppose the average size of a new house built in a certain county in 2014 was 2,270 square feet. A…

A: The random variable house size of a new home follows normal distribution. We have to test whether…

Q: The average cost of tuition, room and board at small private liberal arts colleges is reported to be…

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Q: Previously, an organization reported that teenagers spent 4.5 hours per week, on average, on the…

A: Here, Claim: Teenagers spent higher than 4.5                     hours per week,on average,on the…

Q: The south African department of health is concerned that the average percentage mark-up on a…

A: HERE GIVEN FOR MARK UP ON PRODUCT PRICE DUE TO COVID 19. SOUTH AFRICA HEALTH DEPARTMENT BELIVES THAT…

Q: Independent random samples of patients who had received knee and hip replacement were asked to…

A: Let sample 1 be the sample of knee patients and sample 2 be the sample of hip patients.…

Q: 1. In your own words, what happens to the F-statistic if two variances are different? 2. If the…

A: 1. F-statistic is the ratio between two variances .  It is given by, F= σ12σ22 where σ12 = variance…

Q: A political science professor is interested in comparing the characteristics of students who do and…

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Q: The school nurse thinks the average height of 10th graders have increased. The average height of a…

A: For the given data Perform Z test for one mean .

Q: Cushman and Wakefield reported that the average annual rent for office space in Tampa was $17.63 per…

A: Given claim: Test the claim that the average annual rent is more than $17.63. Null Hypothesis:…

Q: Some college graduates employed full-time work more than 40 hours per week, and some work fewer than…

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Q: In a certain year, the average annual family income in the National Capital Region was P310,860 with…

A: Given information Population mean µ = P310,860 Standard deviation σ = P176,870 Sample size = 320…

Q: According to a recent report, customers who shop at a certain online store spend, on average, $1,500…

A: Test is that whether mean amount spent was greater than $1500. It is given that P-value = 0.25

Q: BIG Corporation advertises that its light bulbs have a mean lifetime, u, of 3000 hours. Suppose that…

A: Hypothesis is a statement about the relationship between the variables. There two hypothesis…

Q: Suppose a recent study of Trucks and SUVs gave an average fuel efficiency of 19.2 mpg for Trucks and…

A: Two sample t tests Hypothesis: H0:μ1=μ2 and H1:μ1<μ2 test statistics is given by…

Q: A facilities manager at a university reads in a research report that the mean amount of time spent…

A: Given that, The provided information are: Hypothesized mean (µo) = 5 Sample size (n) = 11 Sample…