What critical value of t should be used for a 95% confidence interval for the population mean based on a random sample of 21 observations?
Find the t-table here.
O * = 1.721
O t = 1.725
O t* = 2.080
O t* = 2.086

did you get this answer yet?

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."

alright well the answers to your question is

2xy/9 hope this have a nice day : )

step-by-step explanation: