Not random, but we have to assume representative
Independent: Not independent, since wind speeds are generally related.
The distibution is nearly normal, NPP is suitably straight.
(-41.32, -32.54)
We are 90% confident that the true interval of wind speeds lies within this range.
t=1.75
We are 90% confident that the true mean difference is between the interval 1.6 and 13.05
We’d use paired data, so a paired t test.
h0: difference=0 ha: diff =/= 0
Workers are randomly selected. Assume workers are less than 10% of population: independent Distuibtion is suitably normal
P value = ~0
We reject h0.
type 1 error
We assume the servings were randomly selected. we assume brands are indpendent Nearly normal; NPP is suitably stright
h0: difference=0 ha: diff =/= 0
t=1.33
p value = ~0
reject h0
There is not enough evidence to claim significant difference.