Gerry has 25 more basketball cards than he does baseball cards. Step-by-step explanation: Gerry owns a total of 50 sports trading cards. Among these, one-fifth are baseball cards, meaning he has 10 baseball cards. One-tenth of his collection consists of football cards, so he has 5 football cards. The remainder are basketball cards, leading to the conclusion that he has 35 basketball cards. The difference in quantity between his basketball and baseball cards is 25.
Answer:
At a confidence level of 90%, the margin of error is calculated to be 0.5133 grams.
Step-by-step explanation:
The formula for margin of error (E) is: (critical value × sample standard deviation) ÷ sqrt(n)
The sample standard deviation is 1.5 grams.
A 90% confidence level translates to 0.9.
Significance level is determined as 1 - C, which equals 1 - 0.9 resulting in 0.1 or 10%.
The sample size (n) is 25.
Degrees of freedom are calculated as n - 1, which is 25 - 1 equaling 24.
The critical value (t) for 24 degrees of freedom at a significance level of 10% is found to be 1.711.
Using these values, we calculate: E = (1.711 × 1.5) ÷ sqrt(25) = 2.5665 ÷ 5 = 0.5133 grams.
To tackle this problem, you can use the same method from the prior situation.
Option 1: 2/(1/16 + 1/65) = 25.7 mpg
Option 2: 2/(1/14 + 1/85) = 24.0 mpg
_____
Like before, enhancing the least efficient vehicle yields the best outcome.
Answer: D) randomized comparative design
Step-by-step explanation:
A randomized comparative design involves comparing two or more treatments and is characterized by an experiment intended to highlight differences between two groups or populations subjected to distinct conditions or treatments. In the scenario described, pre-existing data was juxtaposed with information collected after the alcohol dangers course.
