A random sample of 36 drinks from a soft drink machine has an average content of 7.4 ounces  with a standard deviation of 0.48 ounces. Test the hypothesis that ? = 7.5 ounces against the  alternative ? < 7.5 at the 0.05 level of significance..

Q: Researchers examined the effect of caffeine on response time in the driving simulator. For the…

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Q: The mean systolic blood pressune of all healthy adults is less than than 121 mm Hg Sample data: For…

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Q: A study of more than 3,000 toco toucans found that their weights were approximately Normally…

A: It is given that  Mean, μ = 20 Standard deviation, σ = 2.3 Z-Score, Z = ( Y - μ )/σ

Q: Assume that adults have iq scores that are normally distributed with a mean of 100 and a standard…

A: Solution: Let X be the adults IQ score has normally distributed with mean μ=100 and standard…

Q: Consider a value to be significantly low if its z score less than or equal to minus−2 or consider…

A: In the question the values are printed two times as 19.419.4. For convenience, the values are taken…

Q: 2. The mean height of 25 male students who showed above average participation in College athletics…

A: There are two independent samples which follows normal distribution. We have to test whether the…

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

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Q: The president of a university claims the standard deviation of ages at his university is 3. A stats…

A: Given that  Population standard deviation =3 Sample size n =20 Sample standard deviation =1.45

Q: Consider a value to be significantly low if its z score less than or equal to −2 or consider a value…

A: Given that, The value is significantly low, if z≤−2 the value is significantly high, if z≥2 Let X be…

Q: waster than in untreated water. Use the level of significance=0.05 Sample1=untreated water,…

A: Given Data : For Sample 1 x̄1 = 7.8 s1 = 1.4 n1 = 5 For Sample 2…

Q: An automobile company is looking for fuel additives that might increase gas mileage. Without…

A: State the hypotheses That is, there is no sufficient evidence to conclude that the mean fuel…

Q: A national study found that college students with jobs worked an average of 24 hours per week. The…

A: The mean is The standard deviation is .

Q: An educational study to be conducted requires a test score in the middle 40% range. If the mean is…

A: Let us assume X=score Given that X follows a normal distribution with mean= 100 and standard…

Q: mean of 50 ounces and a standard deviation of 8.81 ounces. 8 homes with children are surveye Let X =…

A: As the population distribution is normal, it can be said that the distribution of the sample with…

Q: The concentration of benzene was measured in units of milligrams per liter for a simple random…

A: Let,  μ1 :  the population mean benzene concentration for untreated water and  μ2: the population…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 104.6 and a standard…

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Q: A test score of 45 has an equivalent standard score (z-score) of 1.6. If the mean test score is 39,…

A: given dataraw score  x = 45standard score   z = 1.6mean μ = 39S.D.  σ = ?

Q: The concentration of benzene was measured in units of milligrams per liter for a simple random…

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Q: The t-value of t = fall between -to.95 and to.95 because to.95

A: given that n = 13  sample mean =  1195 sample standard deviation = 169.3  population mean = 1016

Q: For a random sample of  70  overweight men, the mean of the number of pounds that they were…

A: given data  n = 70 x¯ = 28 poundsσ = 3.8 poundsbest point estimate for population mean  = ?

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

A: Sample size n=40, sample mean x̄=172.5, population standard deviations σ=119.5,  population mean…

Q: For a random sample of 90 overweight men, the mean number of pounds that they were overweight was…

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Q: A previous study claims that the average time a teenager spends browsing his social media accounts…

A: Sample size(n)=100 Population mean(μ)=6 Sample mean(x)=5.5 Standard deviation(σ)=0.5

Q: In the United States, 36 percent of the people have a blood type that is A positive. From a random…

A: From the information, the sample size is 150 and the sample proportion is 0.36.

Q: The scores on a psychology test were normally distributed with a mean of 65 and a standard deviation…

A: According to empirical rule 68%,95% and 99.7% data fall within one ,two and three standard…

Q: Sally had a z score of +0.25 on a test with a mean of 62 and a standard deviation of 5. What was her…

A: From the provided information,Z score = +0.25

Q: The mean age at first marriage in the U.S. is 28. A random sample of 626 married residents of New…

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Q: A statistics teacher taught a large introductory statistics class, with 500 students having enrolled…

A: Given, The null and alternative hypothesis. and population mean and standard deviation. also Sample…

Q: n a process that manufactures tungsten-coated silicon wafers, the target resistance for a wafer is…

A: As the population standard deviation is not known, we will use t-distribution and perform a t-test.…

Q: Suppose that a sample is taken with an average of 110 and a standard deviation of 15. Calculate the…

A: The relative frequency is found by taking the ratio of frequency to the total frequency. So the…

Q: The average grade of 64 students selected to test the claim that the students in the Business…

A: Given: n=64, x=72 and p-value=0.03. The test is to test:H0:μ=70vsH1:μ&gt;70   So, it is right tailed…

Q: The mean test score for a history test is 63 with a standard deviation of 9. The mean test score for…

A: It is given that the mean test score and standard deviation for history test are 63 and 9, the mean…

Q: A random sample of n1 = 55 stemmed projectile points showed the mean length to be x1 = 3.00 cm, with…

A: There are two independent samples which are stemmed and stem less. We have to test whether there is…

Q: Chocolate bars produced by a certain machine are labeled with 8.0 ounces.  The distrubition of the…

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Q: An automobile manufacturer claims that its van has a 45.5 miles/gallon (MPG) rating. An independent…

A: Given data: An automobile manufacturer claims that its van has a μ=45.5 miles/gallon (MPG) rating.…

Q: Assume that a set of test scores is normally distributed with a mean of 110 and a standard deviation…

A: Given: A set of test scores is normally distributed with a mean of 110 and a standard deviation of…

Q: Assume that the test scores for a large class are normally distributed with a mean of 64 and a…

A: Solution-: Given: We find P(the class received a higher score than 78)=?

Q: The 2008 General Social Survey asked a large number of people how much time they spent watching TV…

A: According to the given question, The 2008 General Social Survey asked a large number of people how…

Q: In a random sample of 10 cell phones, the mean full retail price was $523.30 and the standard…

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Q: The concentration of benzene was measured in units of milligrams per liter for a simple random…

A:

Q: The scores on a psychology test were normally distributed with a mean of 65 and a standard deviation…

A:

Q: Assume the failure rate for drivers road tests in Vancouver is normally distributed. On average 0.33…

A: Given X is normal Distributed with mean µ = 0.33 and standard deviation σ = 0.024 now will using…

Q: In a sample of 14 randomly selected high school seniors, the mean score on a standardized test was…

A: Given,Sample size , n = 14Sample mean , 1197Population mean , 1018Standard deviation, S = 166.9Using…

Q: The histogram displays hours of sleep per day for a random sample of 200 subjects estimate mean…

A: Given that  The histogram displays hours of sleep per day for a random sample of 200 subjects From…

Q: A simple random sample of 36 observations was taken from a large population. The sample mean and the…

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Q: Assume that adults have IQ scores that are normally distributed with a mean of 100.7 and a standard…

A: Given Data : Population Mean,μ = 100.7 Population Standard Deviation,σ = 18.9