I have this 53 math statistic questions and I need to answer it.
Please make sure you can do it correct I must get at least 90% correct.
The yearly average price of unleaded regular gasoline fluctuated as follows:
Year Price per gallon
1983 $1.24
1993 $1.11
2003 $1.59
2012 $3.59
1.What is the gasoline price index number (1993=100) for the year 2012?
A. 143.2
B. 323.4
C. 359.0
D. cannot be determined
A. taking 1984 = 100, the current price is 1984/152.9 = $12.98.
B. prices have increased 152.9%, so it now costs $252.90 to buy goods and services that cost $100 in 1984.
C. prices have increased 52.9%, so it now costs $152.90 to buy goods and services that cost $100 to in 1984.
D. a mistake has been made, because an index number can only take values between 0 and 100.
A. About $39,200
B. About $35,100
C. About $45,900
D. About $25,600
4. From these choices, which is the best graphical method for displaying the distribution of countries Olympic gold medalists come from?
A. histogram
B. line graph
C. bar graph
D. boxplot
E. stemplot
Use this information to answer the next eight questions.
The stock market did well during the 1990s. Here are the percent total return(chance in price plus dividends paid) for the Standard & Poor’s 500 stock index:
Year 1989 1990 1991 1992 199319941995199619971998
Return 31.7 -3.1 30.57.610.11.337.623.033.428.6
A. 5.7
B. 20.0
C. 25.8
D. 28.6
E. 23.0
8. What is the third quartile of these returns?
A. 31.2
B. 31.7
C. 30.5
D. 33.4
E.7.6
8.What is the mean return?
A.20.70
B.33.40
C.20.07
D.22.30
E.25.80
10. Suppose that the correlation of US stock returns with overseas stock returns during these years was r= 0.44, What does this tell you?
A. When US stocks rose, Overseas stocks also tended to rise, but the connection was not very strong.
B. When US stocks rose, overseas stocks tended to fall, but the connection was not very strong.
C. When US stocks rose, overseas stocks rose by nearly the same amount
D. There is almost no relationship between changes in US stocks andthe changes in overseas stocks.
E.Nothing, because this is not a possible value of r
11. If x is the return on US stocks (for example, x =5 means 5% return ) and Y is the return on overseas stocks in the same year, the least-square regression line for predicting Y from Xis y-hat = -2.7 + 0.47x. The US stocks had a return of 10.1% in the year 1993.Using this regression line, you predict that the return on overseas stock that years was
A. 2.05%.
B. -2:23%
C. 3.17%.
D. 27.23
12. Refereeing to the regression line in the previous question, how would you interpret the slop 0.47?
13.As indicated previously, the correlation of US stock return with overseas stock returns during these years was r= 0.44. What percent of the variation in overseas stock returns (y) can be explained by the least-squares regression line presented previously?
A. 0.194%
B. 0.440%
C. 44.0%
D. 19.4%
A. Histogram
A. scatterplot
B. boxplot
C. both a histogram and a boxplot
D. histogram
A.95%
A. line graph
B. scatterplot
C. pie chart
D._ bar chart
E. histogram
19. Which of the following statement is not true of the correlation, r, between the lengths in centimeters and weight in pound of a sample of brook trout?
A. r must take a value between —1 and 1.
B. r would not change if we measured these trout in inches instead of centimeters.
C. r is measured in centimeters per pound.
D. If longer trout tend to also be heavier, then r is greater than 0.
A. Bill, because his score of 190 is higher than George’s 180.
B. Bill, because his standard score is higher than George’s.
C. Bill and George have the same rank in their leagues, because both are 30 pins above the mean.
D. George, because his standard score is higher than Bill’s.
A.No. A negative correlation would allow that conclusion, but this correlation in positive.
B.Yes. Strong correlation proves causation.
C.Yes. The data show that stays are shorter in smaller hospitals.
23. Mary standards score on a SAT is -3. Which is the following is the best explanation of Mary’s standards score?
Use this information to answer the next five questions.
The length of human pregnancies from conception to birth varies according to a distribution that is approximately normal with a mean of 266 days and a standard deviation of 16 days. The figure below is the normal curve for this distribution of the length of human pregnancies measured in days, where linesdelineate standards deviations from the mean.
Use the 68-95-99.7 rule or Table B to answer the questions.
A. 234 days
B. 202 days
C. µ+3ᶞ
D. 218 days
A. 234 to 298 days
B. 218 to 314 days
C. 250 to 282 days
D. 218 to 282 days
26. What percent of human pregnancies are longer than 250 days?
A. 16%
B. 34%
C. 68&
D. 84%
27. What percent of human pregnancies are between 234 and 282 days?
A. 68.0
B. 81.5%
C. 84.0
D.99 .7%
28. Approximately 24% of the human pregnancies are shorter than_____ days
A.260
B. 255
C. 250
D. 234
Approximately what percentage of the 1,029,655 Salt Lake metropolis residents in 2010 were not unclaimed?
A. 0.27%
B. 27%
C. 60%
D. 73%
31. The statistics student collected data for a term project and found the mean of his data to be 20 and the standard deviation to be 2. Later he discovered that one of his observations had accidentally been recorded as I9 and should be recorded as 19. What will happen to his mean and standard deviation once he fixes the recording error?
32. Which statistical measure is not strongly affected by a few outliers in the data?
A. The mean
B.The correlation coefficient
C.The standard deviation
D.The median
33. Adult women in China have heights which are normally distributed with the mean of 155 centimeters and a standard deviation of 8 centimeters. Adult women in Japan have heights which are normally distributed with mean 158 centimeters and standard deviation 6 centimeters. Which country has the higher percentage of women taller than 167 centimeters?
Use this information to answer the next three questions
This is a histogram of milligrams of potassium in 80 selected cereals.
Milligrams of Potassium in 80 Cereals
A. 20
B. 90
C. 125
D.175
A. Because the range of possible potassium content is from 15 to 335 milligrams
B. Because values for potassium content are given on the horizontal axis and bars represent their frequencies.
C. Because it shows how potassium content is related to a possible lurking variable.
D. Because it displays how the patterns in potassium content could apply in a broader context..
A.66.75 inches or more
B.67.50 inches or more
C.68.25 inches or more
D.65.00 inches or more
40. An educator says that the correlation between student’s grades and the type of music they prefer is r=-0.7. This means that
A. Students who prefer classical music tend to have higher grades
B.Student who prefer classical music tend to have lower grades
C.The educator is confused, because correlation makes no sense in this situation.
D.There is almost no association between grades and tastes in music.
Which of the following statement is true?
43.A local planning commission is interested in finding out what proportion of the city’s residents are opposed to constructing a new baseball stadium in the downtown area. A random sample of 1,870 residents is obtained, and 41.2% of them are opposed to the stadium. A 95% confidence interval was created for the proportion of the city residents that are opposed to constructing a new baseball stadium in the downtown area.By “95 confidence, “ we mean that
44.A consumer organization was concerned that an automobile manufacturer was misleading consumer by overstating the average fuel efficiency ( measures in miles per gallon or mpg) of a particular car model. The model was advertisedto get 27 mpg.To investigate, the researcher selected a random sample of 10 cars of that model. Each car was then randomly assigned a different driver. Each car was driven for 5,000 miles, and the total fuel consumption was used to compute the mpg for the car. What is the parameter of interest?
A. US outside Utah, because the sample size (1000) is large than for Utah (600)
A. True
B. False
A. True
B. False
A. True
B. False
A. True
B. False
A. True
B. False
Part 2: SHORT ANSWER AND Easy Questions
Answer completely but concisely.
51.What do we say that “association does not imply causation� explain and give example.
52. What is extrapolation, and why is it risky? Explain and give an example.
7386 82 80 71 67 46 39 77 89
A) Make a stemplot of the distribution of scores. Briefly describe the shape of t he distribution.
B) Based on the shape of the stemplot, calculate the appropriate measures of center and spread.