A random sample of 130130 observations produced a mean of ?=30.2x¯=30.2 from a population with a normal distribution and a standard deviation ?=4.49σ=4.49. (b) Find a 9595% confidence interval for ?μ

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A:

Q: A random sample of 85 eighth grade​ students' scores on a national mathematics assessment test has a…

A: Answer: Given, n=85 μ=275 x=284 σ=30 (a) Option E. H0:μ=275  VS  HA:μ>275(claim)

Q: A random sample of 85 eighth grade students' scores on a national mathematics assessment test has a…

A: GivenMean(x)=286standard deviation(σ)=40sample size(n)=85α=0.11

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Q: A researcher studying the lifespan of a certain species of bacteria. A preliminary sample of 35…

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Q: is there enough evidence to support the​ administrator's claim

A: Given that  Sample size(n)= 76 Sample mean (x¯) = 283 Population standard deviation(σ) = 31 Level of…

Q: random sample of 81 eighth grade​ students' scores on a national mathematics assessment test has a…

A: Given: Sample size (n) = 81 Sample mean x¯=290 Hypothesized mean μ= 285 Population standard…

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A: Solution: We have to find the t-critical value (tα/2) at the given significance level 1- 0.95=0.05…

Q: A random sample of n = 16 scores is obtained from a population with a standard deviation of σ = 18.…

A: Solution: From the given information, n=16, σ=18, x-bar=86 and z=2.

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Q: A random sample of 85 eighth grade​ students' scores on a national mathematics assessment test has a…

A: Solution: a. State the hypotheses. Null hypothesis: That is, the mean score for the state’s eighth…

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Q: A researcher studying the lifespan of a certain species of bacteria. A preliminary sample of 35…

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Q: A researcher knew that before cell phones, a person made on average 2.5 calls per day. He believes…

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Q: A researcher knew that before cell phones, a person made on average 2.5 calls per day. He believes…

A: Consider that μ is the population mean number of calls per day. That is, μ = 2.5.

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

A: Given data is appropriate for testing of hypothesis . to test z-test for single mean . Because it is…