Final Answer for 6.39 ÷ 0.09?
2 answers:
You might be interested in
Answer:
critical value = 1.645
The 90% confidence interval = ( -22.62, -17.58)
Step-by-step explanation:
Given that:
the sample size = 178
the sample size = 226
the sample mean = 54.4
the sample mean = 74.5
population standard deviation = 18.58
population standard deviation = 9.52
level of significance ∝ = 1 - 0.90 = 0.10
The critical value for is 1.645
For the construction of our confidence interval, we use 90% since that is used to find the critical value.
∴
The margin of error =
2.52
The lower limit =
= ( 54.4-74.5) - (2.52)
= -20.1 - 2.52
= -22.62
The upper limit =
= ( 54.4-74.5) + (2.52)
= -20.1 + 2.52
= -17.58
The 90% confidence interval = ( -22.62, -17.58)
Answer:
Wrong problems = 32
Step-by-step explanation:
Total no of problems = 200
Charlotte earned a grade of 84% on her multiple-choice.
Correct problems,
Wrong problems = 200 - correct problems
= 200 - 168
= 32
Hence, there are 32 problems on the final exam Charlotte get wrong.