The state test scores for 12 randomly selected high school seniors are shown on
ID: 2948701 • Letter: T
Question
The state test scores for 12 randomly selected high school seniors are shown on the right. Complete parts (a) through (c) below. Assume the population is normally distributed. 1423 1220 990 691 728 839 722 743 543 627 1446 950
(a) Find the sample mean. x overbarequals nothing (Round to one decimal place as needed.)
(b) Find the sample standard deviation. sequals nothing (Round to one decimal place as needed.)
(c) Construct a 95 % confidence interval for the population mean mu. A 95 % confidence interval for the population mean is ( nothing , nothing ). (Round to one decimal place as needed.)
Explanation / Answer
The statistical software output for this problem is:
Summary statistics:
95% confidence interval results:
Hence,
a) Sample mean = 910.2
b) Sample standard deviation = 304.3
c) 95% confidence interval: (716.8, 1103.5)
Column Mean Std. dev. Data 910.16667 304.31767Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.