Question

Calculate 80%, 90% and 99% confidence intervals for the player weight standard deviation. Include here the sample standard deviation and sample size -30pts-

S= 16.47 n= 50 〖

χ²〗_R=(chi-square right tail)=

〖χ²〗_L=(chi-square left tail)=

80% confidence interval and interpretation:

〖χ²〗_R=

〖χ²〗_L=

90% confidence interval and interpretation:

〖χ²〗_R=

〖χ²〗_L=

99% confidence interval and interpretation:

How do these confidence intervals relate to the population standard deviation?

Answer 1

i)

ii)

iii)

iv) With increase of confidence level, width of the confidence interval increases.