Give an 80 confidence interval for the total number of

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Reference no: EM13606700

Signatures to a petition were collected on 676 sheets. Each sheet has enough space for 42 signatures, but on many sheets a smaller number of signatures was collected. The number of signatures per sheet were counted on a random sample of 50 sheets. The results are given below:

Number of signatures	42	41	36	32	29	27	23	19	16	15
Frequency	23	4	1	1	1	2	1	1	2	1

Number of signatures	14	11	10	9	7	6	5	4	3	Total
Frequency	1	1	1	1	1	3	2	1	1	50

a) Give an 80% confidence interval for the total number of signatures.

b) How (if at all) does the non-normality of the Number of signatures (with a greatest frequency at the upper end - 42) affect your answer?

c). After the sample in the Table of question 1 was taken, the total number of completely filled sheets (with 42 signatures each) was counted and found to be 326 (out of the total of 676). Use this infornmation to improve your estimate of the total number of signatures and find a standard error to that estimate.

Reference no: EM13606700

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