PLANAR brianna wells& Math& 146DE: Introduction to Statistics, Winter 2018 Homew

Question

PLANAR brianna wells& Math& 146DE: Introduction to Statistics, Winter 2018 Homework: HW7.3 Score: 0 of 1 pt 7.3.RA-6 Which of the foilowing is NOT a requirement for constructing a confidence interval for estimating a population mean with o known? Choose the correct answer below. O A. The sample is a simple random sample HW Sco 60' 30 (5 complete) B. The sample measures a quantitative value. The confidence level is 96% c. O D. Either the population is normally distributed or n> 30, or both Click to select your answer and then click Check Answer All parts showing Clear All

Explanation / Answer

7.3. RA. 6

Here option A is not correct as we require a simple random sampling.

Option B is not correct as it measures a quantitive value and it is necessary.

OPtion D is not correct Either the population is normally distributed or n > 30 , or both as we know the population mean with sigma known. (This is required)

Here option C is correct as it is not necessary that confidence level is 95%. So option C is the answer here..

QUestion 7.4.5 - T

80% confidence, n =29 ; s = 0.25 mg

Here dF = 29 -1 = 28

xL2 = xL2 (dF = 28 ; 0.90) = 18.939

xR2 = xR2 (dF = 28 ; 0.10) = 37.916

confidence ineterval estimate for   

Lower Limit = sqrt [(n - 1)s2/xR2]= sqrt[(29 - 1) * 0.252 /37.916] = 0.215

Upper Limit = sqrt [(n - 1)s2/xR2]= sqrt[(29 - 1) * 0.252 /18.939] = 0.304

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