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Based on a random sample of 100 individuals, the average individual spends on online media between $20 and $80 per month at 95% confidence. If

Based on a random sample of 100 individuals, the average individual spends on online media between $20 and $80 per month at 95% confidence. If we need to obtain a narrower interval, we should....

a) decrease the sample size or decrease the confidence level

b) decrease the sample size or increase the confidence level

c) increase the sample size or increase the confidenc level

d) increase the sample size or decrease the confidence level

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