The composition of the earth’s atmosphere during prehistoric times can be measured from trapped bubbles.  Nitrogen measurements were made on 32 samples with a mean of 71 and a sample standard deviation of 5.   If today’s atmosphere’s nitrogen content is 78, state a null and alternate hypothesis concerning changes in the earth’s atmosphere.                            Ho:                           Ha:         Which test would you use to evaluate this study?   Test your hypothesis by selecting an a level:   Test and report your P-value                 What conclusions did you reach?                  Do you have any issues with the t test?

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A: We have given that.   X~N( μ , ?^2 )   μ =500, ? =?   Z-score =( x - μ )/?

Q: What is the closest P-value?

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A: Given : X¯ =193.13 σ = 22.11 n = 60 Hypothesis : H0:μ = 195  H1:μ < 195

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Q: Step 1 H₁: Step 3 Step 5 Step 2 (f Step 4 Step 6

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Q: their alarm. Refer to the following set of responses as your data: 7 7 8 8 8 8 8 8 10 10 11 11 12 12…

A: since there are multiple questions, first three parts answered. kindly repost for more help .

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A: given that N=50 sample mean= summation of x/N

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A: Given,  Mean μ=23 miles per gallon(mpg) Standard deviation σ=4.9 (mpg)Let x be the mileage above…