Given Information:
The proportion of electric cars sold in 2012 = p₁ = 0.1%
The proportion of electric cars sold in 2016 = p₂ = 0.5%
Sample size of electric cars in 2012 = n₁ = 10,000
Sample size of electric cars in 2016 = n₂ = 20,000
Confidence level = 95%
Required Information:
Change in the proportion of electric cars sold from 2012 to 2016 = ?
Answer:
Change in the proportion of electric cars sold from 2012 to 2016 = (0.284%, 0.516%)
Step-by-step explanation:
The change in the mean is given by
The change in standard error is given by
Where z is the value of z-score corresponding to 95% confidence level.
The change in the proportion of electric cars is
Therefore, we are 95% confident that the change in the proportion of electric cars sold from 2012 to 2016 is between (0.284%, 0.516%)
Answer:
density is equal to mass divided by volume.
d=m/v
Answer:
tropical rain forest
Explanation:
Of all the different environments on the planet, the one that sticks out as by far the most diverse in tree species (also all plants, and animals) is the tropical rain forest
Answer:
1. Independent Variable
2. Systematic Random Sampling
3. Time of Day
4. Consent
5. 3 misbehaviors
6. 4
7. A positive influence on behavior
Explanation:
1. The candy is the independent variable because it is the controlled part of the experiment: whether it is given out or not.
2. The strategy is Systematic Random Sampling because Marnie gives candy out every 5 kids, but the kid who gets it is random.
3. An extraneous variable would be the time of day she observes their behavior (young children might be fussier depending on what time it is), but she controls this by studying kids behavior from 12-2 each time.
4. One ethical challenge could be that she didn't ask for the consent of the child or parent if they could be watched and studied for the experiment.
5. The mode of the candy condition is 3 misbehaviors, it's the amount that occurs most frequently.
6. The range in the no-candy condition is 4. You take the highest amount of misbehaviors and subtract the lowest amount (4-0=0).
7. Authoritative parenting could help improve a child's behavior in the store because they have expectations and enforced rules on how their child should act in a public setting, but will also listen to their kids reasoning if they want to buy something like dessert.
Answer:
a student measures the length of a building three times
Explanation:
what is the question
