Answer: 83
Step-by-step explanation:
The confidence interval for population mean is given by :-

Given : The student obtained the following 95% confidence interval (in grams) for the population mean, (862,1028).
Here,
Lower limit of the confidence interval :
(1)
Upper limit of the confidence interval :
(2)
Subtracting (1) from (2) , we get

Hence, the margin of error = 83
Answer:
i need brainliest
249u = 66 or 249 X u = 66
Step-by-step explanation:
when u is multiplied by 249 you get 66
Answer:
x=3
Step-by-step explanation:
3+4=7
3x7=21
Answer:
Null hypothesis: ∪ₐ = ∪ₓ
Alternative hypothesis: ∪ₐ ≠ ∪ₓ
Step-by-step explanation:
Null hypothesis: ∪ₐ = ∪ₓ
Alternative hypothesis: ∪ₐ ≠ ∪ₓ
where ∪ₐ represents mean of sample of new cars and ∪ₓ represents mean of sample of older cars.
Using a difference in means t test will help determine if new owners tune up their cars more frequently than older car owners.