Answer:
The true proportion for the population would be between 0.386 and 0,398 (0.392±0.06) in 95% confidence level.
Step-by-step explanation:
Confidence interval for true population proportion can be computed as p±ME where
- p is the sample proportion (
) - ME is the margin of Error from the mean
and margin of error (ME) can be found using the formula
ME=
where
- z is the corresponding statistic in 95% confidence level (1.96)
- p is the sample proportion (
)
- N is the sample size (250)
Using the numbers
ME=
≈ 0.06
Then the true proportion for the population would be p±ME = 0.392±0.06 in 95% confidence level.
Answer:
15%
Step-by-step explanation:
The first step is to calculate the decrease
= 500-425
= 75
The percentage decrease can be calculated as follows
= 75/500 ×100
= 0.15×100
= 15%
Hence the percent decrease is 15%
Answer:
28
Step-by-step explanation:
70% of the 40 items are pencils.
0.70 × 40 = 28
28 of the items are pencils.
x is equal to - 2/3 after collecting like terms