Call me: A sociologist wants to construct a 99% confidence interval for the proportion of children aged 8 - 10 living in New York who own a smartphone.(a) A survey by the National Consumers League estimated the nationwide proportion to be 0.40 . Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.02 ?

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A: From given data we have : μ=49,σ=4 we find that the Z-score corresponding to a cumulative…

Q: You measure 23 watermelons' weights, and find they have a mean weight of 39 ounces. Assume the…

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A: We have given the data set of two samples (column A and column B) as follows, X1 X2 99.77 97.13…

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Q: You're a sociologist studying whether grocery prices are different in the inner cities than they are…

A: Given data: SU IC 94.63 95.75 97.31 101.2 103.5 90.87 96.51 101 97.53 93.46 93.13…

Q: The following shows the age of 20 children Age frequency 1 5 2 6 3 7 4 2

A: We have given that,  Age (X)  frequency (f)  1 5 2 6 3 7 4 2 Then,…

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Q: n a survey funded by the University of Washington School of Medicine, 1,577 of 1,900 adult Seattle…

A: Givenx=1577sample size(n)=1900confidence level=99%

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A: The objective is to describe the given summary statistics of Control and Experimental groups.

Q: Refer to the sample data for polygraph tests shown below. If one of the test subjects is randomly…

A: Given that :   No(Did not lie) Yes (Lie) Total Positive test results 15 46 61 Negative test…

Q: Check here for instructional material to complete this problem. Evaluate the following formula for…

A: given data, x¯1=2.37x¯2=2.62μ1-μ2 =0s1=0.65s2=0.92n1=34n2=34test statistics for the  given data=?

Q: Which of the following variables is not a qualitative or categorical variable? Species: Warbler,…

A: The variable is species.

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Q: Check here for instructional material to complete this problem. X1 A n₁ Evaluate the following…

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Q: onsider the population consisting of {4,5,9}. If samples of size n = 2 are randomly selected from…

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Q: hi the table is Nominal, Interval, or Ordinal

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Q: 3 For an SRS {Y: ³;=, from the normal distribution 1 fiy (цілето 2) vivore (y;u, - Show that the…

A: Here, The simple random samples of size n taken from the normal population. We have to show that the…

Q: There are 3 red balls and 2 blue balls in a bag. balls will be drawn without replacement. Find the…

A: GivenNo.of red balls=3No.of blue balls=2Total no.of balls=5

Q: How's the economy? A pollster wants to construct a 99.8%  confidence interval for the proportion of…

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Q: The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on…

A: From the provided information, Sample size (n) = 705 Sample mean (x̄) = 60.3 Sample standard…

Q: Compare your answer in Problem 1, part m) with answer in Problem 2, part k). Is there a difference…

A: Given There are 2 95% CI which are as follows: -3.60 , -0.23 -3.79, -0.09

Q: he effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on…

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Q: (f) What is the standard error of the estimate of the percentage of males among patients discharged…

A: f) From the given information, x=13 and n=25.

Q: The finish times for marathon runners during a race are normally distributed with a mean of 195…

A: given data  normal distributionμ = 195 minutesσ = 25 minutesP(x<180 minutes) = ?

Q: Question: What measure of central tendency do you think would be best to describe the number of…

A: Introduction The mean, median and mode are the measures of central tendency.

Q: 5 The probability that a person in the United States has type B* blood is 10%. Three unrelated…

A: Let X be the random variable from binomial distribution with probability (p) = 10% = 0.10 and sample…

Q: Consider the population consisting of {4,5,9}. If samples of size n = 2 are randomly selected from…

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Q: A weapons manufacturer uses a liquid propellant that can get mixed with another liquid to produce a…

A: Given.,P(X)=(0.21)(0.79)x-1    ;   x=1,2,3....Let X be the number of cartridges sampled until a…

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A: For the distribution of the amount of time (in seconds) cars spend in drive-throughs (which is given…

Q: A study found that the mean amount of time cars spent in drive-throughs of a certain fast-food…

A: Mean(µ) = 138.7Standard deviations (σ) = 31X ~ N (µ, σ )= N(138.7 31)

Q: a. Construct the 95% confidence interval for the mean number of years of for lower class and middle…

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Q: Using sample information x = 43, o= 3 , n= 11 calculate confidence intervals for 90% and 95%

A: The given information is: x=43σ=3n=11

Q: Compute C:

A: GivenC78

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Q: To the right are the outcomes that are possible when a couple has three children. Assume that boys…

A: From the given information we have  Total number of couple have exactly 1 boy child is 3 and, Total…

Q: Determine the following for the following joint probability distribution: X y fxy(x,y) a. E(XY) = b.…

A: Note: According to Bartleby guidelines expert solve only one question and maximum three subpart of…

Q: Use dataset "HT_4143.xls" and conduct a two-sample t-test using Excel. You'd like to test the null…

A: We have given data set of two samples (column 1 and column 2) as follows, X1 X2 99.73 98.69…

Q: USA Today reports that the average expenditure on Valentine's Day was expected to be $100.89. Do…

A: Given information: x¯M=131.68nM=48σM=34x¯F=65.89nF=30σF=20z=2.576

Q: t 7 8 9 10 11 12 13 14 15 16 17 18 19 20 data a Based on the boxplot above, identify the 5 number…

A: Formula for Interquartile Range IQR = Q3 - Q1