Suppose a shoe store wants to determine the current percentage of customers who are males. how many customers should the company survey in order to be 90% confident that the estimated (sample) proportion is within 3 percentage points of the true population proportion of customers who are males?

1067

Step-by-step explanation:

Given : Level of confidence = 0.90

Significance level :

By using the normal distribution table,

Critical value :

Margin of error :

The formula to find the population proportion if prior proportion of population is unknown  :-

Hence, the company should survey minimum sample having size  =1067

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step-by-step explanation:

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4 and 5)16.97 or 12√2

6)15.59 or 9√3

7)y = 15.59 or 9√3     x =27

8)17.80