A developmental psychologist would like to know whether success in one specific area can affect a person’s general self-esteem. The psychologist selects a sample of 25 ten-year-old children who all excel in athletics. These children are given a standardized self-esteem test. In the general population of ten-year-olds, the scores on the standardized self-esteem test are normally distributed with a mean of 70. The mean score for the sample is 72 with a standard deviation of 5. Correct decision and conclusion? Use the .05 significance level

Q: Public health statistics indicate that 26% of  American adults smoke cigarettes. A random sample of…

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Q: Imagine you are the Chief of a large police department, and you are concerned about drinking among…

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Q: Calculate the mean, standard deviation, and variance for the following five scores: 9, 4, 7, 1, 4.

A: Considering the scores as population. The population mean is, μ=∑XN=9+4+7+1+45=255=5 Thus, the…

Q: Calculate the mean, standard deviation, and variance for the following five scores: 9,4,7,1,4.

A:

Q: Please also explain why you determined whether or not the results are statistically significant.…

A: Given information isn1=40n2=40s1=0.50

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Q: In a normally distributed data set with a mean of 24 and a standard deviation of 4.2, what…

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Q: An advertising agency has stated that 20% of all television viewers watch a particular program. How…

A: From the provided information, An advertising agency has stated that 20% of all television viewers…

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A: Consider X is a random variable defined as the height of a successful basketball player.The provided…

Q: video game c

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A: Given that  n = 90 , p = 31% = 0.31 , q = 1 - p = 1 - 0.31 = 0.69 X ~ Binomial (n = 90 , p = 0.31) X…

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Q: Suppose you read in the newspaper that registered nurses earned an average annual salary of $49,110…

A: Claim :  salary was significantly lower than the $49,110.

Q: Consider the following distribution of scores: 2,5,3,7,6,5. What is the mean?

A:

Q: Of the 500 people who took the civil servant acceptance test in one government agency, the average…

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Q: For 100 randomly selected adults, compute the mean and standard deviation?

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Q: A study by the National Center for Health Statistics suggested that women between the ages 20 and 29…

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Q: marketing analyst’s sample of six companies’ social media apps value were$25, $7, $22, $33, $18,…

A:

Q: 500 freshmen at Arundel University took part in a math comprehension test. The scores were normally…

A: From the provided information, Mean (µ) = 75 Standard deviation (σ) = 7 Let X be a random variable…

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Q: The Survey of Study Habits and Attitudes (SSHA) is a psychological test that measures the…

A: Mean = 118.3 Sd =25 N= 25 Hypothesis test Ho :μ = 110Ha:μ > 110

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A: Given that, Mean = 72 Standard deviation = 7

Q: he scores on a psychology exam were normally distributed with a mean of 65 and a standard deviation…

A: Given,μ=65σ=6

Q: A credit score is used by credit agencies (such as mortgage companies and banks) to assess the…

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Q: The year Lamar graduated college, he got a job as an entry-level software engineer working for a…

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Q: what is the value of the standard deviation of the weekly earnings of the bus drivers?

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Q: The amount of Jen's monthly phone bill is Normally distributed with a mean of $ 76 and a standard…

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Q: Is it worth pursuing a doctoral degree in education if you already have an undergraduate degree? One…

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A: Sample size n =24 Sample mean=735.6 Standard deviation =74.5 NOTE:- According to bartleby guidelines…

Q: A recent study found that 69% of all adults over 50 wear sunglasses for driving. In a random sample…

A: Formula : Mean = np Standard Deviation  :

Q: A distribution of scores has no mode and the same median and mean values. This indicates that the

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Q: In hundreds of studies with many thousands of participants, first-born children scored better than…

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.