Answer:
100/1
Step-by-step explanation:
Unit rate = over 1
____
500/5 = 100/1 (WE DIVIDED BY 5)
Answer:
The number of observations required is closest to 609 ⇒ b
Step-by-step explanation:
The formula of the sample size is n = [( . σ)/E]² , where
- σ is the standard deviation
- E is the margin of error
- is the z-score, where 1 - α = confidence interval
∵ We want 90% confidence interval for the average amount
spent on books by freshmen in their first year at a major
university
∴ 1 - α = 90%
∵ 90% = 90 ÷ 100 = 0.90
∴ 1 - α = 0.90
- Subtract 1 from both sides
∴ - α = -0.10
- Divide both sides by -1
∴ α = 0.10
- Find the value of
∴ = = 0.05
- Look to the normal distribution table to find z-score for this
value with opposite sign
∴ = 1.645
∵ The interval is to have a margin of error of $2
∴ E = 2
∵ We estimate that the standard deviation of the amount spent
will be close to $30
∴ σ = 30
- Substitute these values in the formula above
∴ n = [(1.645)(30) ÷ 2]²
∴ n = 608.855
- Round it to the whole number
∴ n = 609
The number of observations required is closest to 609
Answer:
Yes, the marketing manager's claim is true.
Step-by-step explanation:
p = 0.61
Phat = 545 /826 = 0.66
H0 : p = 0.61
H1 : p ≠ 0.61
The test statistic :
(Phat - p) / √pq/n
q = 1 -p = 1 - 0.61 = 0.39
(0.66 -0.61) / √(0.61*0.39)/826
0.05 / 0.0169709
Test statistic = 2.95
Using the p-value from Zscore calculator:
Pvalue at 2.95, two tailed ;
Pvalue = 0.0032
Reject H0; if Pvalue < α
Since, Pvalue < α ; Then, the marketing manager's claim is true
Both are not equivlant to the top speed of the model plane because caculator op.
Answer:
12
Step-by-step explanation:
12+12=12 and 12 = 12 and 9+10= 21