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:
J≈36
Explanation:
There is a typo in your question and I think you meant J+3, not 3+3.
The equation to find J would be:
(J+3)×J=1330
J+3×J=1330
-3
J×J=1327
J^2=1327
J=36.42801120017
J≈36
A spectacular population increase has accompanied the west coast’s industrial revolution. The Portland metropolitan area showed a 31 per cent increase in population since 1940; the Seattle area shows an increase in population for the same period of 200,000; and an estimated 1,500,000 people have entered California since 1940. Since most industrial activity on the west coast is confined to the manufacture of aircraft and the construction of ships, sharp curtailment of employment is threatened in the post-war period. With a population increase of 14 per cent, California, for example, faces the problem of shifting 1,500,000 workers from war activities to civilian jobs after the war. . . .
The typical white defense migrant is a young man, twenty-five years of age or younger, married, from a small town or rural area in the Pacific Northwest, anxious to settle in the area, and primarily interested in industrial employment in the post-war period. A study made recently in the Kaiser yards in Portland indicates that only 23.6 per cent of the migrants expressed a definite intention to leave after the war; that only a very few have maintained economic ties elsewhere or have jobs to which they might return; that considerable numbers have purchased property in the area; that a majority have their families with them; and that 86 per cent must find new employment immediately after their present employment terminates.
The supply curve will be composed of the following points
(10, 1000) from the statement: 1000 shoes in the market at $10
(25, 1200) from the statement: 12000 shoes at $25 per pair
(40, 1400) from the statement: <span>$40 per pair, the existing firms increase production to 1400 each</span>
