Question

For this problem, carry at least four digits after the decimal in your calculations. Answers may vary slightly due to rounding. Santa Fe black-on-white is a type of pottery commonly found at archaeological excavations at a certain monument. At one excavation site a sample of 570 potsherds was found, of which 353 were identified as Santa Fe black-on-white.

(a) Let p represent the proportion of Santa Fe black-on-white potsherds at the excavation site. Find a point estimate for p. (Round your answer to four decimal places.)

(b) Find a 95% confidence interval for p. (Round your answers to three decimal places.)

lower limit
upper limit

Give a brief statement of the meaning of the confidence interval.

Answer: 95% of the confidence intervals created using this method would include the true proportion of potsherds.

(c) Do you think that np > 5 and nq > 5 are satisfied for this problem? Explain why this would be an important consideration.

Answer: Yes, the conditions are satisfied. This is important because it allows us to say that p̂ is approximately normal.    

Answer 1

given data are:-

x =number of potsherds that were identified as Santa Fe black-on-white =353

n = sample size = 570

a).a point estimate for p be:-

b). z critical value for 95% confidence level , both tailed test be:-

the 95% confidence interval for p be:-

lower limit	0.579
upper limit	0.659

interpretation:-

we are 95% confident that the true population proportion will lie within 0.579 and 0.659.

c).Yes, the conditions are satisfied. This is important because it allows us to say that p̂ is approximately normal.    

[ as np= 570*0.6193 =353.001 >5

nq= 570*(1-0.6193)= 216.999 >5

so, the conditions are satisfied ]

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