18,055
-
3,138
———-
14,927
14,927
+
18,055
———-
32,982
A. The point estimate of μ1 − μ2 is calculated using the value of x1 - x2, therefore:
μ1 − μ2 = x1 – x2 =
7.82 – 5.99
μ1 − μ2 = 1.83
B. The formula for
confidence interval is given as:
Confidence interval
= (x1 –x2) ± z σ
where z is a value
taken from the standard distribution tables at 99% confidence interval, z =
2.58
and σ is calculated
using the formula:
σ = sqrt [(σ1^2 /
n1) + (σ2^2 / n2)]
σ = sqrt [(2.35^2 /
18) + (3.17^2 / 15)]
σ = 0.988297
Going back to the
confidence interval:
Confidence interval
= 1.83 ± (2.58) (0.988297)
Confidence interval
= 1.83 ± 2.55
Confidence interval
= -0.72, 4.38
Answer:
to sell 7000 it took 10 weeks
it took 3 weeks to sell 210 books
Step-by-step explanation:
Answer:
20 miles
Step-by-step explanation:
10miles × 2 = 20miles
Answer:
profitability ratios (e.g., net profit margin and return on shareholders' equity)
liquidity ratios (e.g., working capital)
debt or leverage ratios (e.g., debt-to-equity and debt-to-asset ratios)
operations ratios (e.g., inventory turnover)
Step-by-step explanation:
XD and Lol
