The standard deviation for the lifetimes of lawn mowers is estimated to be 800 hours (for the entire population). We'd like to collect data and be 97% confident that our margin of error will not exceed 50 hours. What is the minimum sample size we would need to select, to achieve this

So the answer for this case would be n=1206 rounded up to the nearest integer

Step-by-step explanation:

We know the following info:

the standard deviation estimated7

The margin of error is given by this formula:

   (a)

And on this case we have that ME =50 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

  (b)

The critical value for 97% of confidence interval and using a significance level of and , replacing into formula (5) we got:

So the answer for this case would be n=1206 rounded up to the nearest integer

i believe your answer is 99.7% of 7-year-old children are between 46.6 inches and 49.5 inches tall.

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step-by-step explanation: