a first number plus twice a second number is 15. twice the first number plus the second totals 33. find the numbers
1 answer:
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Answer:
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Step-by-step explanation:
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Answer:
The width is
Step-by-step explanation:
From the question we are told that
The population standard deviation is
The sample size is
The sample mean is
Given that the confidence level is 99% then the level of significance is mathematically represented as
=>
=>
Next we obtain the critical value of from the normal distribution table, the value is
Generally margin of error is mathematically represented as
substituting values
The width of the 99% confidence interval is mathematically evaluated as
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