Term
| The sample analyzed in report 1 was from what year of the Malawi Household survey? |
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Definition
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| What is the most common native language in Malawi? |
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Definition
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| The country of Malawi shares its borders with what 3 countries? |
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Definition
Mozambique
Zambia
Tanzania |
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Term
| In Malawi, annual GDP per capita in recent years has been what? |
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Definition
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Term
| When a Distribution is right-skewed.... |
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Definition
| the mean exceeds the median |
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Term
| The sum of the deviations about the mean |
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Definition
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Term
| A random variable, X, has a density function. Its cumulative distribution function is F(x), which measures what? |
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Definition
| Area under F(x), to the left of x |
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Term
| An optimal predictor of a random variable Y, as discussed in Chapter 1, what? |
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Definition
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| The random variable X has the density function f(x) and cumulative density function F(x). The value of x such that F(x) = 0.5 is? |
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Definition
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Term
Consider this sample drawn from the distribution of X:
1,2,2,3,7
What is the value ψ that minimizes? |
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Definition
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Term
| Given that E(X) = u, identify the correct statement |
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Definition
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| A major axis is plotted through a scatter plot of house price and house size, P and S respectively. A forecaster wants to minimize the expected value of the square of the forecaster error. What is correct? |
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Definition
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Term
| What is true about a dummy variable? |
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Definition
Values are either 1 or 0
If you know the mean, you know the variance
Skew is positive if the mean is less than 0.5 |
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Term
| The mean of a dummy variable is 0.48. What are the median and 3rd quartile values? |
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Definition
| Median is 0, third quartile is 1 |
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Term
| What does the Law of Large Numbers state? |
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Definition
| a sample mean converges on the population mean as the sample size increases |
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Term
| The skewness of a distribution is measured using which sample moment? |
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Definition
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Term
| A histogram with m bins has density, d, on the vertical axis. What is most appropriate? |
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Definition
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Term
| To say that Φ hat is a consistent estimator of the population parameter Φ is to say what? |
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Definition
| Φ hat is an efficient estimator of Φ |
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Term
| What correctly describes marginal, joint and conditional probabilities? |
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Definition
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Term
| F and U are dummy variables. In a sample, Cov(F, U) <0 which implies what? |
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Definition
| the ratio of women to men is lower in the urban subsample than in the rural subsample |
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Term
| Suppose a population mean regression function E(YlX) is linear. This implies what? |
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Definition
| The slope of the linear regression is σxy/σx2 |
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Term
| In any sample X1, X2, X3 what? |
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Definition
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Term
By definition the sample covariance of X and Y is
1/n∑(Xi-xbar)(Yi-ybar)
Can the sample covariance be simplified to
1/n∑XiYi?
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Definition
| Yes, if 1 of the means is 0 |
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Term
| What number is closest to the sample size used in Report 1? |
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Definition
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Term
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Definition
| A land-locked Sub-saharan sountry south of the equator |
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Term
| According to World Bank data, Malawi's per capita income places the country where? |
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Definition
| Amongst the 5 poorest countries in the world |
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Term
| The currency most commonly used in Malawi is what? |
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Definition
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Term
| What proportion of Malawians claim to read and write in the most common native language? |
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Definition
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Term
| The skewness of a distribution is measured using which sample moment? |
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Definition
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Term
| What does cov(F, Educ) measure? |
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Definition
| It will certainly be positive if women have more education than men |
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Term
Consider 1,2,3,3,7. What is the value of ψ that minimizes
∑(Xi-ψ)^2? |
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Definition
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Term
| To say that 0 hat is an unbiased estimator of the population parameter 0 is to say what? |
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Definition
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Term
| The population mean regression of Y on X is linear. The slope of this mean regression line is what? |
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Definition
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Term
| the relationship between relative frequency, f, density d, and bin width, w, is what? |
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Definition
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Term
| R plots a histogram with density on the vertical axis when? |
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Definition
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Term
| When the loss from making prediction errors is the square of the prediction error, the expected loss when the optimal predictor is equal to what? |
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Definition
| variance or conditional variance of the random variable |
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Term
| Galton discovered the concept of "regression towards the mean" while investigating the heights of parents and children. What did he find? |
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Definition
Taller than average parents have adult children who on average are shorter than them
taller than average children have parents who on average shorter than them |
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Term
| What does the Law of Large Numbers state? |
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Definition
| a sample mean converges on the population mean as the sample size increases |
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Term
| Samples that are right-skewed tend to have |
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Definition
| means that are greater than medians |
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Term
| True or False - 75% of observations lie below the third quartile? |
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Definition
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Term
| The mean of a dummy variable is 0.52. What is the median and 3rd quartile values? |
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Definition
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Term
| In Educ there was a large number of 0 values. What was this largely due to? |
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Definition
| All children who did not complete grade 8 were assigned 0 years of education |
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Term
| In Educ there was a large number of 0 values. What was this largely due to? |
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Definition
| All children who did not complete grade 8 were assigned 0 years of education |
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Term
| Discrete random variables X and Y both take on 1 of 2 values: 1 and 2. They are positively correlated. What is appropriate? |
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Definition
| E(X l Y =1) < E(X l Y =2) |
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Term
| How is a mean regression function estimated? |
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Definition
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Term
| X and Y are random variables that follow a bivariate normal distribution. State 3 facts that are true. |
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Definition
Population of Y given X is linear
Conditional distribution of Y given X is symmetric
The conditional variance of Y given X is independent of X |
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