Mathematics, 16.04.2020 04:16 joynerjaila
Last year, a study showed that the average ATM cash withdrawal took 65 seconds with a standard deviation of 10 seconds.
The study is to be repeated this year, but we need to determine the required sample size (n). Then, you will use a random sample from this year to construct a confidence interval for the average (mean) time it takes to withdraw cash from an ATM.
For the confidence level (1 - α) = 0.95, the critical value (CV) is
Select one:
a. 1.96
b. 1.64
c. 1.28
d. 2.58
How large a sample (rounded up) would be needed to estimate this year's mean with 95% confidence and a margin of error of 4 seconds? Use the standard deviation from last year study as the population standard deviation (σ).
Select one:
a. 25
b. 17
c. 11
d. 42
How large a sample (rounded up) would be needed to estimate this year's mean with a 95% confidence and a margin of error of 2 seconds? Use last year's standard deviation as the population standard deviation (σ).
Select one:
a. 97
b. 68
c. 41
d. 167
For the confidence level (1-α) = 0.99, the critical value (CV) is
Select one:
a. 2.58
b. 2.33
c. 1.28
d. 1.96
How large a sample (rounded up) would be needed to estimate this year's mean with a 99% confidence and a margin of error (ME) of 4 seconds? Use the standard deviation from last year as the population standard deviation (σ).
Select one:
a. 42
b. 34
c. 167
d. 97
Answers: 3
Mathematics, 21.06.2019 17:40
Follow these steps using the algebra tiles to solve the equation −5x + (−2) = −2x + 4. 1. add 5 positive x-tiles to both sides and create zero pairs. 2. add 4 negative unit tiles to both sides and create zero pairs. 3. divide the unit tiles evenly among the x-tiles. x =
Answers: 2
Mathematics, 21.06.2019 19:00
Me with geometry ! in this figure, bc is a perpendicular bisects of kj. dm is the angle bisects of bdj. what is the measure of bdm? •60° •90° •30° •45°
Answers: 2
Mathematics, 21.06.2019 23:00
In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ac=26 and ch=8, find bh.
Answers: 3
Last year, a study showed that the average ATM cash withdrawal took 65 seconds with a standard devia...
Mathematics, 02.04.2020 21:12
Mathematics, 02.04.2020 21:12
English, 02.04.2020 21:12
History, 02.04.2020 21:12
Biology, 02.04.2020 21:13
Mathematics, 02.04.2020 21:13