Of 58 bank customers depositing a check, 15 received some cash back. (a) Construct a 90 percent confidence interval for the prop
1 answer:
Answer:
0.1640 ≤ p ≤0.3532
Explanation:
Sample size (N) = 58 customers
Z-score for 90% interval (Z) = 1.645
The proportion of customers that received some cash back is given by:
The confidence interval for the proportion of all depositors who ask for cash back is determined by the following relationship:
Applying the given data:
The upper and lower limits are:
Using a 90% confidence level, the interval for the proportion (p) is:
0.1640 ≤ p ≤0.3532
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