NickiaSouthern New Hampshire University
A random sample of 44 taxpayers claimed an average of $9,700 in medical expenses for the year. Assume the population standard deviation for these deductions was $2,379. Construct confidence intervals to estimate the average deduction for the population with the levels of significance shown below. a.5% b.10% c.20% a. The confidence interval with a 5% level of significance has a lower limit of $ nothing and an upper limit of $ nothing .
The caloric consumption of 38 adults was measured and found to average 2,136. Assume the population standard deviation is 270 calories per day. Construct confidence intervals to estimate the mean number of calories consumed per day for the population with the confidence levels shown below. a.92% b.95% c.99% a. The 92% confidence interval has a lower limit of and an upper limit of .
A student measured the lead content of a paint sample 6 times. The standard deviation of the measurements was found to be 1.3% of the average. Calculate the confidence interval at the 90% confidence level. confidence interval: + Can this student be 90% confident that the true value is within 1.3% of the measured average? yes no