In a study of 225 adults, the average heart rate was 72 beats per minute. Assume the population of heart rates is known to be approximately normal, with a standard deviation of 10 beats per minute. What does a margin of error of 1.1 for the 90% confidence interval of the average beats per minute mean?

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emmak · Answer

can anyone help???

sxdsouls · Answer

The lower and upper bounds of the confidence intervals must be equally distanced from the mean , = `70.9 - 73.1 `

emmak · Answer

here are the answers
There is a 90% chance that the population mean is between 70.9 and 73.1 beats per minute.
There is a 90% chance that the population mean is between 62 and 82 beats per minute.
There is a 10% chance that the population mean is less than 72 beats per minute.
There is a 10% chance that the population mean is more than 72 beats per minute.

emmak · Answer

oh ok, thank you so much!!!