what distribution is referred to as approximately symmetric

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orchestra answered 1 year ago

Suppose that the distribution of scores on an exam is mound shaped and approximately symmetric. The...

Suppose that the distribution of scores on an exam is mound shaped and approximately symmetric. The exam scores have a mean of 110 and the 16th percentile is 85. (Use the Empirical Rule.) (a) What is the 84th percentile? (b) What is the approximate value of the standard deviation of exam scores? (c) What is the z-score for an exam score of 90? (d) What percentile corresponds to an exam score of 160? % (e) Do you think there were...

1. Suppose that the distribution of scores on an exam is mound shaped and approximately symmetric....

1. Suppose that the distribution of scores on an exam is mound shaped and approximately symmetric. The exam scores have a mean of 110 and the 16th percentile is 85. a. What is the 84th percentile? b. What is the approximate value of the standard deviation of exam scores? c. What is the z-score for an exam score of 90? d. What percentile corresponds to an exam score of 160? e. Do you think there were many scores below 35?...

1. According to the empirical rule, for a distribution that is symmetric and bell-shaped, approximately _______...

1. According to the empirical rule, for a distribution that is symmetric and bell-shaped, approximately _______ of the data values will lie within 3 standard deviations on each side of the mean. 2. Assuming that the heights of boys in a high-school basket- ball tournament are normally distributed with mean 70 inches and standard deviation 2.5 inches, how many boys in a group of 40 are expected to be taller than 75 inches? 3. Let x be a random variable...

A SYMMETRIC distribution with TWO parameters. A SYMMETRIC distribution with ONE parameter used when the population...

A SYMMETRIC distribution with TWO parameters. A SYMMETRIC distribution with ONE parameter used when the population standard deviation is unknown. A NORMAL distribution with mean 0 and standard deviation 1. The distribution of a sample statistic. Gives the NORMALITY of sample means for large sample. Using data to determine properties of population parameters. A single value used to estimate a population parameter. A z-score determined by the probability (1-Confidence Level/100)/2 t-distribution PARAMETER equal to n-1, where n the the sample...

What is a SYMMETRIC versus SKEWED DISTRIBUTION, give an example?

1. Which of the following statements about the t-distribution is NOT true? The t-distribution is symmetric...

1. Which of the following statements about the t-distribution is NOT true? The t-distribution is symmetric about 0. The t-distribution has heavier tails than the standard normal distribution. The t-distribution has support on the entire real number line The t-distribution is characterized by two parameters, the mean μ and the variance σ2. 2.Which of the following statements is true? When division by a factor of n-1 is used, the sample variance s2 is an unbiased estimator of the population variance...

The normal distribution is a special distribution of quantitative data that has a symmetric Bell-shape. Data,...

The normal distribution is a special distribution of quantitative data that has a symmetric Bell-shape. Data, such as the average temperature in a region or over time, often have a normal distribution. Why? The graph that we were looking at in class in on the nytimes website. It’s title is “It’s not your Imagination. Summers are getting hotter.”( This is only if you’ve wanted context to the question, although I do not think you need the graph to answer). I...

The distribution of the heights of the first grade students is mound – shaped and symmetric...

The distribution of the heights of the first grade students is mound – shaped and symmetric with the mean height of 140 cm and standard deviation of 5 cm. According Empirical rule What % of heights is between 125 and 155 cm What % of heights is between 135 and 150 cm What % of heights is less than 130 cm What % of heights is less than 130 cm

Given the following distribution, is it a Binomial distribution or approximately a Binomial distribution ? Please...

Given the following distribution, is it a Binomial distribution or approximately a Binomial distribution ? Please justify your answer (prove or disprove) . X 0 1 2 3 4 P(X) 0.240 0.412 0.265 0.076 0.008

For the following data sets, are the samples positively skewed, negatively skewed or approximately symmetric? (You...

For the following data sets, are the samples positively skewed, negatively skewed or approximately symmetric? (You can use R to justify your answer.) (a) A = {0.9961905,0.9493184,0.8332006,0.9513567,0.9856061,0.9136707,0.9706223, 0.6834221, 0.8527071, 0.8052218, 0.9798628, 0.9862662}. (b) B = {0.256907054,0.371948965,0.302661234,0.245459145,0.488603820,0.435416721, 0.203228122, 0.004436282, 0.115262446, 0.058988085, 0.256066243, 0.141507075}. (c) C = {0.139061819,0.025883617,0.096332657,0.115620817,0.274004925,0.059080122, 0.072580116, 0.008576388, 0.068673036, 0.379232748, 0.117313230, 0.086692960}.

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