Past experience indicates that the time required for high school seniors to complete a standardized test is a normal random variable with a mean of 35 minutes. If a random sample of 20 high school seniors took an average of 33.1 minutes to complete this test with a standard deviation of 4.3 minutes, test the hypothesis, at the 0.05 level of significance, that μ = 35 minutes against the alternative that μ < 35 minutes.

Q: A random sample of 76 eighth grade students' scores on a national mathematics assessment test has a…

A: given data claim : μ &gt; 285n = 76x¯ = 292σ = 30α = 0.15

Q: 21.36 Blood pressure. A randomized comparative experiment studied the effect of diet on blood…

A:

Q: Do political science classes require less writing than history classes? The 47 randomly selected…

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A: Using standardization of Normal distribution and compare the value with Standard Normal value.

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A: HERE GIVEN , The manager of a computer retails store is concerned that his suppliers have been…

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A: Consider, the pooled variance, spooled2=(n1-1)s12+(n2-1)s22n1+n2-2…

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A: Given information- Significance level, α = 0.05 Sample size, n = 50 We have given that power of her…

Q: A clinical psychologist is interested in testing whether serial killers are more introverted than…

A: x=41, s= 6.8, n=9Ho:μ=36  vs H1:μ≠36 σ( unknown)so we use t statistict=(x-μ)/s/n…

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A: The question is about confidence interval.Given :Claim : Population mean of the wait times ( ) =…

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A: Given data: Mean = 3.5 g Sample mean = 3.586 g Standard deviation  = 0.195 g Sample size  = 45…

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A: Let X1 be the random variable such that number of pages written in political science classes. x̅1:…

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A: Given that, Sample size n=20 Sample standard deviation s=2.064

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A: Given Information: The accounts of a company show that on average, accounts receivable are $90.36.…

Q: The average salary of graduates entering the Data Science field is reported to be $ 40,000. To test…

A: Given data: Population mean  = $ 40000 Sample size = 20 Sample mean = $ 43228 Sample standard…

Q: A class survey in a large class for first‑year college students asked, “About how many hours do you…

A: Given Data:  x¯=13.7 σ=7.4 n=463   a) Null and Alternate Hypothesis: B) H0:μ=13 hours ; Ha:μ&gt;13…

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A: Consider that μ defines the population mean activity level.

Q: A high school principal was concerned about the time his students were spending on home work in a…

A: given data, n=50x¯=18.50σ=10.2α=0.10claim :μ&lt;20

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

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A: As per the Bartleby guildlines we have to solve first three subparts and rest can be reposted...…

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A: Given that  Sample sizes n1=70      , n2=85       Sample means X̄1=8.84     , X̄2=9.05      ?1 =0.30…

Q: For this study, we should use Select an answer t-test for the difference between two independent…

A: As per our guidelines, we are allowed to answer thee sub-parts per question.  The provided sample…

Q: A researcher is interested in testing whether chocolate causes hyperactivity in children. To test…

A: Consider that μ defines the population mean activity level.

Q: Do political science classes require the same amount of writing as history classes? The 59 randomly…

A:

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A:

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A: Solution: Let µ1 be the average mileages of brand 1 cars and µ2 be the average mileages of brand 2…

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A: Given information- Population mean, µ = 3.8 years Population standard deviation, σ = 0.6 years…

Q: Do political science classes require less writing than history classes? The 47 randomly selected…

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Q: Do male and female servers at Swank Bar work the same number of hours? A sample of 50 female servers…

A:

Q: Suppose a researcher is interested in investigating the effectiveness of a new diet plan at reducing…

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

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A: The random variable X follows normal distribution. We have to find the test value. This is one…

Q: Suppose a researcher decided to test a hypothesis that adding compost to tomato plants increases…

A:

Q: The lifespan of a certain brand of an electric motor is normally distributed with a mean value of 10…

A: Using standardisation of normal and then used z table

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A: The sample standard deviation us known as 10.Assumptions for performing a hypothesis test about mean…

Q: Suppose a researcher decided to test a hypothesis that adding compost to tomato plants increases…

A:

Q: Suppose a researcher is interested in investigating the effectiveness of a new diet plan at reducing…

A: The given information is that the sample group size is 45 women. The sample mean BMI is 29.5 and the…

Q: A very large company is interested in its emplayees' productivity. The company reports from its…

A:

Q: The manager of a computer retails store is concerned that his suppliers have been giving him laptop…

A: We have given that   Mean(µ) = 3.1Standard deviations (σ) = 0.4X ~ N (µ, σ )= N(3.1, 0.4) n = 39

Q: Do male and female servers at Swank Bar work the same number of hours? A sample of 65 female servers…

A: Given that  And  Which of the following does your data suggest?   Male servers work more hours…