In using the standard normal distribution to construct a confidence interval for the population mean, what assumptions are necessary if the sample size n is less than 30?
Question 2
A city-paid consumer advocate wants to secure information about the mean length, , of coin-separated car wash cycles. A previous study reported the standard deviation of the length of car wash cycles to be 6 minutes. The advocate timed the wash cycle at 81 randomly selected car wash locations and the mean of the sample was 4.8 minutes. The 90 percent confidence interval estimate is 3.70 to 5.90 minutes. Interpret this interval.
Normal glomerulus. Acute glomerulonephritis.
Phylogenetic tree based on the distribution of 120 alleles in 42 populations from around the world,
Sources of income for U.S. population aged 65 and over.
How to sketch a quadratic equation that is in standard form (Question 2)
Human population growth, 1700 - present
The obese (ob) mouse mutant, shown on the left (a normal mouse is on the right), has provided many c