Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15. Find P40​, which is the IQ score separating the bottom 40​% from the top 60​%. Round your answer to nearest tenth.

Q: The Institute of Education Sciences measures the high school dropout rate as the percentage of…

A: Given:n =  1000Population Proportion, p = 8.1% = 0.081Significance level, α = 5% = 0.05

Q: What statistical test would you use to compare three different groups on some dependent variable?

A: Given : What statistical test would you use to compare three different groups on some dependent…

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Q: Jane's instructor asks her to build a 95% confidence interval with a margin of error of $30.  What…

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Q: 1.) The number of unhealthy days in selected cities are given below. Construct a Frequency…

A: For the given data, we need to construct a frequency  distribution table with classes of "7" and a…

Q: For the standard normal distribution shown on the right, find the probability of z occurring in the…

A: z be a standard normal random variable. z~N(μ,σ)where μ=0 and σ=1find the probability of z occurring…

Q: A pollster wants to conduct a pre-election poll with a margin of error of 2.5% and a 95% confidence…

A: We have given that,  Margin of error (E) = 2.5% = 0.025 and confidence level = 95%  Then, We will…

Q: You are an insurance adjuster. On average there are between 10 and 50 storm-damaged roofs each year.…

A: Given information: On average there are between 10 and 50 storm-damaged roofs each year.

Q: ch. 8 confidence interval mean question 3 Assume that a sample is used to estimate a population…

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Q: The distribution of actual weights of 8-oz chocolate bars produced by a certain machine is normal…

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Q: b) Now suppose that the same sample proportions came from a sample of 30 times as large. That is,…

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Q: mes required by three workers to perform an assembly-line task were recorded on five randomly Eed…

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Q: e the data and draw a bell shaped curve B. sketch out either a frequency graph or scatter plot C.…

A: Whenever we visualize the data, we need the data so that we can make a plot for it. So, option (a)…

Q: Professors collected data consisting of eye color and gender of statistics students. Among 888 male…

A: From the provided information,

Q: Sarah runs the 400 meter dash, her finishing times are normally distributed with a mean of 63…

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Q: You are assisting the county assessor (whose job is to assess the value of properties for property…

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Q: 24 has a sample Assuming the population has an approximate normal distribution, if a sample size n =…

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Q: 4) A factory manufactures cups. The manager knows from past xperience that 5% of the cups produced…

A: Let X be the random variable from binomial distribution with probability (p) = 5% =  0.05 and sample…

Q: 3.1 Solve the below problem Let Y,, Y2, and Y, be random variables, where E (Y,) = 1, E (Y2) =…

A: Solution is in image uploaded below

Q: Roll eight fair six-sided dice. Find P (0 - 0 - 4 - 0 - 0 - 4).

A: Given information: Rolling eight fair six-sided dice. P1=P2=P3=P4=P5=P6=16

Q: The Empirical Rule For Normal Distributions (a.k.a the 68-95-99.7 Fule) od 68% 95% 99.7% mean-3s…

A: GIiven that mean =120 ,s.d =10

Q: The weekly amount of money spent on maintenance and repairs by a company was observed, over a long…

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Q: A laboratory technician is interested in the proportion of 1-liter containers used in the lab that…

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Q: The average monthly rent for an apartment in San Francisco is $3630. A random sample of 30…

A: It is given that Sample size n = 30 Sample mean M = 3450 Population SD = 850 Level of significance =…

Q: Assume that a sample is used to estimate a population proportion p. Find the 99.5% confidence…

A: Given that

Q: It has been found that on average, nine shoppers enter a Shoprite supermarket in any given 15-minute…

A: Given:  On average, nine shoppers enter a Shoprite supermarket in any given 15-minute period. What…

Q: You'd like to test if a sample of prisoners is more likely to have PTSD (diagnosed, not diagnose a…

A: From the given information we want know correct testing method.

Q: Rick O'Shea is a candidate for governor of a big state.  To get the latest voter opinion poll, his…

A: The sample is the subset of population. The proportion explains the favorable cases related to the…

Q: The variables X & Y have a negative correlation of -.70, therefore you could predict that    A. None…

A: From the provided information, The variables X & Y have a negative correlation of -0.70.

Q: Part 1: OLS basics Consider the data in the table below. Y X 3 1 8. 3 2 1 7 1. In the space below…

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Q: Two-way ANOVA differs from one-way ANOVA in that: O Two-way ANOVA has 2 IVs, whereas a one-way ANOVA…

A: Option D is the correct answer. Because, Two way has 2 independent Random variables while the…

Q: a) According to the graph, define the input, including units. b) According to the graph, define the…

A: Given;

Q: Assume M&M candies are randomly selected and grouped in bags of 40 pieces per bag and that 16% of…

A: Givensample size(n)=40p=0.16Let "x" be the no.of green M&M's in any one…

Q: Part 1: OLS basics Consider the data in the table below. Y X 3 1 4 8 3 2 1 7 1. In the space below…

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Q: accounting examination is 26, how large a sample is needed to estimate the true mean score within 6…

A: HERE GIVEN , n = ??? population standard deviation  =  26  confidence level  = 99%

Q: You are using a hypothesis test to make sure a machine will not underfill or overfill 14 oz boxes of…

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Q: Seattle Grace Medical Center. As part of a long-term study of individuals 65 years of age or older,…

A: Given the sample data A and B as Sample A Texas Washington South Carolina 7 9 3 5 4 3 6 12…

Q: question #19 You want to obtain a sample to estimate a population proportion. Based on previous…

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Q: Illustration 116. The income of a group of 10,000 persons was found to be normally distributed with…

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Q: A psychologist believes that it will take at least an hour for certain disturbed children to learn a…

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Q: Liz just completed a test where her baseline assumtion is that the local paint factory is following…

A: Type 1 error: If the null hypothesis is rejected when it is actually true. Type 2 error: In case of…

Q: ou want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based…

A: The provided information is σ=43.8 α=0.01 The margin of error is E=0.025 The critical value is…

Q: What is the linear regression equation? 2. Estimate the demand for the product if the price is…

A: From the given data we find the linear regression equation equation and estimate demand at price 15

Q: The pie chart shows the distribution of the opinions of parents on whether a college education is…

A: The categorical variable is response. We have to test whether the distribution of the opinions of…

Q: An analysis of variances produces dfbetween 4 and dfwithin 80. How many people were in each…

A: Given:  Degrees of freedom between the group=5  And degrees of freedom within the group=80  Then to…

Q: At Conner Company, a custom manufacturer of printed circuit boards, the finished boards are…

A: Given A = Poor electrolyte coverage B = Improper lamination C = Low copper plating D = Plating…

Q: On the basis of the above information, construct a decision tree to facilitate the analysis of this…

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Q: 70.20 Female Non-Credit BOGO 1 4  $              36.30 Female

A: Transaction ID Sale Amount Gender Payment Type Promotion Type Weeks After Advertisement 1 50.8…