In a left-skewed distribution, is median higher than mode? (A) True B False
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A: μ1=0.78, σ1=0.15μ2=0.74, σ2=0.13
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A: Consider two samples that were taken randomly Assume the two samples follows normal distribution…
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Q: ) In a normal distribution, what is the z- score of an observation that is at the 39th percentile?
A: We have to find z score..
Q: What are the three different measures of central tendency?
A: The three measures of central tendency are: 1.Arithmetic Mean:The arithmetic mean of a variable is…
Q: Which of the following is a true statement? (A) All symmetric bell-shaped curves are normal. (B) All…
A: A normal curve is identified using the values of the mean and standard deviation to show the…
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A: given data right skewed distribution sample size (n) = 70 shape of distribution of sample mean= ?
Q: What is the standard error of the estimate? A) 1.595 B) 1.666 C) 0.970 D) 1.920 If there was no…
A: Close Friends Self-Esteem Mean 8.90 5.20 SD 3.75 2.15 a = 2.904 and b = 0.258
Q: c. Why will the standard deviation not be a good measure of risk when returns are negatively skewed?
A: It is an important part of statistics. It is widely used.
Q: Suppose that the scores of architects on a particular creativity test are normally distributed.…
A: we have to find minimum z scores to be in top given %. (a) 50% (b) 44% (c) 64% (d) 28% (e) 23%
Q: There are a number of instances in which it is better to use a median instead of a mean as the…
A: Solution Median is used when data has skewed distribution and data is quantitative. But when the…
Q: Use the normal distribution to the right to answer the questions.(a) What percent of the scores are…
A: a) Given that μ=19.5σ=5.4 The percent of the scores are less than 19 is, PX<19=PX-μσ<19-μσ…
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A: It is an important part of statistics. It is widely used.
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Q: For a normal distribution, what z-score would separate the distribution so that there is 30% in the…
A: Answer: From the given data, We have to find, For a normal distribution, the z-score would separate…
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A: We have to answer question on hypothesis testing
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A: Given that. Best describes the unimodal distribution Median is much larger than mean
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A: A negatively skewed distribution means that there is a 'hump' in the data on the right side of the…
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A: Given: p = 35% = 0.35 n = 1000 The variance is calculated as: The standard deviation can be…
Q: A distribution is positively skewed. Accordingly, show the rank between the 3 measures of central…
A: A distribution is positively skewed. Accordingly, show the rank between the 3 measures of central…
Q: A sample of scores has a mean of M = 26, a median of 28, and a mode of 29. What is the most likely…
A: Given Mean = 26 Median = 28 Mode = 29
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A: Correct statements are 3 There are fewer selling prices between the first quartile and the median…
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Q: f the value of adult male cholesterol is a normal distribution with a mean of 198 and a standard…
A: The question is about normal dist. Given : Mean of cholesterol value of adult male ( μ ) = 198 Std.…
Q: In a Scrabble tournament, the scores were normally distributed and the mean score was 420.2 points…
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Q: more than or equal to this value less than or equal to this value more than this value ss than this…
A: We have given that, The 75th percentile is a value such that at least 75 percent of the…
Q: A distribution has a shape that is strongly skewed left. Which of the following statements is most…
A: It is given that the distribution has a shape that is strongly skewed left.
Q: A professor at a university gives her large class an examination and finds that the scores follow…
A: mean = 73 sigma = 8
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A: Does it seem to you that people tend to be absent more on some days of the week than on others First…
Q: The tail will be on the right-hand side of a normal distribution for any negative z-score. (True or…
A: The z-score identifies an exact location in a distribution with a single number is the sign of…
Q: A sample of scores has a mean of M = 20, a median of 28, and a mode of 29. What is the most likely…
A: Given Mean=20 Median=28 Mode=29
Q: What is the probabilities associated with the normal distribution of P(- 3.25
A: Z = -3.25 P( Z ≤-3.25) denoted as P( -3.25)
Q: Which of the following statements regarding Z scores is FALSE? a. It indicates whether the raw score…
A: X is a random variable that follows the normal distribution with mean μ and SD σ then the z score…
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- A physical fitness association is including the mile run in its secondary-school fitness test. The time for this event for boys in secondary school is known to possess a normal distribution with a mean of 470 seconds and a standard deviation of 60 seconds. The fitness association wants to recognize the boys whose times are among the top (or fastest) 10% with certificates of recognition. What time would the boys need to beat in order to earn a certificate of recognition from the fitness association? (round to the nearest tenth)A health psychologist knew that corporate executives in general have an average score of 2.55 with a standard deviation of 0.5 on a stress inventory and that the scores are normally distributed. In order to learn whether corporate executives who exercise regularly have different stress scores, the psychologist measured the stress of 30 exercising executives and found them to have a mean score of 2.76. a. Using the five steps of hypothesis testing, was the group of 30 exercising executives different from executives in general? (Use the .05 significance level.) Be sure to sketch the distributions involved. Be sure to fully state the five steps and show ALL calculations/work. b. Additionally, explain the logic of what you did to a person who understands hypothesis testing for studies in which the sample consists of a single individual but is unfamiliar with hypothesis testing involving a sample of more than one individual. (Be sure your explanation includes a discussion of the…Q5: b) For a dataset that has a symmetrical distribution, compare the mean and the median. None of the other choices The mean and median will be hugely different The mean and median will be fairly close together The mean and median will not be fairly close together
- Which statement accurately describes the proportions in the tails of a normal distribution? The proportion in the left-hand tail is smaller than the proportion in the right-hand tail. O Proportions in both the left-hand and right-hand tails tend to be relatively large. OProportions in both tails are the same., O Proportions in both tails are negative.If alpha is 5%, what is the level of confidence in a right-tailed Ztest?A teacher wishes to know whether the males in his/her class have more conservative attitudes than the females. A questionnaire is distributed assessing attitudes and the males and the females are compared. Is this an example of descriptive or inferential statistics
- In 1995, the median price of a PC was $1200. Suppose that a random sample of100 persons who bought their PCs during that year recorded the amount spent (byeach of them) on his/her PC. State the approximate sampling distribution of ˆp, theproportion of persons who spent more than $1200 on a PC. Find the probabilitythat more than 60% of this group spent more than $1200. NOTE: Please explain each part, so the problem can be used as a Study Guide1. What does it mean to have a skewed distribution? What causes a skew in statistical terms? Are there specific types of business or economic types of data where one would expect the data to be skewed? 2. When would you use the median rather than the mean as a measure of central tendency? Why?What position in the distribution corresponds to a z-score of z = +2.00?
- A researcher wants to know if there is a difference between the mean amount of sleep that people get for various types of employment status. The table below shows data that was collected from a survey. Full Time Worker Part Time Worker Unemployed 8 9 9 6 6 8 7 8 10 8 9 10 7 7 9 7 9 9 8 7 7 Assume that all distributions are normal, the three population standard deviations are all the same, and the data was collected independently and randomly. Use a level of significance of α=0.01α=0.01.H0: μ1=μ2=μ3H0: μ1=μ2=μ3H1:H1: At least two of the means differ from each other. For this study, we should use The test-statistic for this data = (Please show your answer to 3 decimal places.) The p-value for this sample = (Please show your answer to 4 decimal places.) The p-value is αα Base on this, we should hypothesis As such, the final conclusion is that... There is sufficient evidence to support the claim that employment status is a factor in the…In a normal distribution of scores, four participants obtained the following deviation scores: +1, −2, +5, and −10. (a) Which score reflects the highest raw score? (b) Which score reflects the lowest raw score? (c) Rank-order the deviation scores in terms of their frequency, starting with the score with the lowest frequency.Consider the population of car drivers in the United States, and how many traffic tickets they've each received over the course of their lives. Would the distribution of these traffic tickets be left-skewed (where we often see mean median)? Pick ONE option Left-skewed Right-skewed It would be unreasonable to guess Potentially both at once