Statistics Question

Q: The average exam score of a physics class is 75 points with a standard deviation of 3 points. Peter ...

A: Given information Mean µ= 75 Standard deviation σ = 3 Peter’s score x = 72

Q: Example 4. Blood Pressure Measurements   Find the regression equation, letting the first variable be...

A: Let us define X as the Right Arm and Y as the Left Arm. Excel Procedure: Enter X and Y data in Excel...

Q: Every day for an entire week, a cup of coffee was purchased at Starbucks, McDonalds, and Dunkin Donu...

A: We have to draw appropriate conclusions about the hypothesis.  

Q: Assume that the population has a normal distribution.  A laboratory tested twelve chicken eggs and f...

A: It is given that sample mean is 185 and standard deviation is 17.6.

Q: A sample of voters were polled to determine the likelyhood of measure 324 passing. The poll determin...

A: Given that, The formula for determine the confidence interval for proportion is,

Q: Professor Pete’s calculus class has the following scores: 19   21   31   32   37   45   52   55   62...

A: Given, The scores are 19, 21, 31, 32, 37, 45, 52, 55, 62, 63, 63, 65, 65, 77, 78 Formula of Mean for...

Q: Just need B. These are old practice problems

A: Given that, s2=47.9,σ2=42.3n=26 The null and alternative hypothesis is,

Q: The "Dogs of the Dow" are the stocks listed on the Dow with the highest dividend yield. The followin...

A:

Q: Is Event B dependent or independent of Event A?   A: A mosquito lands on your arm. B: You get a mosq...

A:

Q: Suppose the following are the seasonal indices for the first three quarters of the year for a quarte...

A: The average of the seasonal indices is 100 Q1+Q2+Q3+Q44=100Q4=400-(73.9+84.1+107.1)Q4=400-265.1Q4=13...

Q: Professor Pete’s calculus class has the following scores: 19   21   31   32   37   45   52   55   62...

A: The given data for Professor Pete’s calculus class's scores 19 21 31 32 37 45 52 5...

Q: This exercise is based on the following information, gathered from student testing of a statistical ...

A: The given table is:   Mean Time (minutes) Standard Deviation Task 1:  11 3 Task 2 12.4 11 T...

Q: Students receive an A+ on a 60 point test if they score 55 points or more.  The marks of a large num...

A: Given: X~N(μ,σ)μ=50σ=5

Q: The number of calls received by a car towing service averages 19.2 per day (per 24hour period). Afte...

A: Given  λ= Average no. of calls received by a car towing service =19.2 per day =19.224per hour X= No....

Q: Suppose that 38% of people own dogs. If you pick two people at random, what is the probability that ...

A: Given that, Probability, p = 38% = 0.38 Sample size = 2

Q: Let p be the population proportion for the following condition. Find the point estimates for p and q...

A: It is an important part of statistics. It is widely used. 

Q: Below is the result of running linear regression in R. The least-squares regression equation is Call...

A: 29. From the given regression model, The independent variable is Variable_W Dependent variable: Vari...

Q: Calcium is an important mineral for optimal body functioning. The recommended intake for Calcium for...

A: Given that, Calcium is an important mineral for optimal body functioning. The recommended intake for...

Q: In a poll, 800 adults in a region were asked about their online vs. in-store clothes shopping. One f...

A:

Q: This is not a test, its practice.

A: There are three different groups of tree seedlings. These will be the treatments. Number of observat...

Q: In one town, 28% of all voters are Democrats. If two voters are randomly selected for a survey, find...

A: Given that, Probability, p = 28% = 0.28 Sample size = 2

Q: Consider a drug that is used to help prevent blood clots in certain patients. In dinical trials, amo...

A: Given: n=6034x=153α=0.10p0=0.03

Q: 2) The average price of computers in a store is $1800, and the standard deviation is $100. a) If th...

A: Solution: 2. Let X be the computer price. From the given information, X follows normal distribution ...

Q: The total stopping distance (in feet) was measured for a midsize four-door sedan driving in dry cond...

A: x y xy x2 y2   10 27 270 100 729   20 61 1220 400 3721   30 104 3120 900 10816   40 168 6720...

Q: Does the source of medical information affect people’s confidence that it is true? To answer this qu...

A: An independent variable is known as the variable that is used to estimate the dependent variable. Th...

Q: The U.S. Energy Information Administration (US EIA) reported that the average price for a gallon of ...

A: Given Information: Mean = $2.94 Standard deviation σ= $0.20 Confidence level = 95% = 0.95 Significan...

Q: Find the indicated probability.   A bin contains 64 light bulbs of which 10 are defective. If 5 ligh...

A: It is an important part of statistics. It is widely used. 

Q: Outliers have VERY LITTLE OR NO EFFECT on which of the following? Check all that apply. Range...

A: We know that- Mean and the standard deviation is strongly affected by the outliers. It skewed the da...

Q: A manufacturer of light bulbs claims that its light bulbs have a mean life of 702 hours and a standa...

A: Given that, μ=702σ=124n=130 The mean and standard deviation of the sample mean is,

Q: Construct a confidence interval for μd​, the mean of the differences d for the population of paired ...

A: The difference is, Before After Difference 74 73 1 83 77 6 75 70 5 88 77 11 84 74 10 ...

Q: There are 8 members on a board of directors. If they must form a subcommittee of 6 members, how many...

A: Given,   There are 8 members on a board of directors. If they must form a subcommittee of 6 members.

Q: Which of the following research situations would be most likely to use an independent-measures desig...

A: Independent - measures design : It is a research method where multiple experimental groups are used....

Q: When 3,011 adults were surveyed in a Pew Research Center poll, 73% said that they use the internet. ...

A: n = 3011 smaple proportion = 0.73 population proportion = 0.75      

Q: The accompanying table shows the results of a survey in which 250 male and 250 female workers ages 2...

A: The table shows the results of a survey in which 250 male and 250 female workers.

Q: Test the given claim. Write the claim in symbolic form, write the Null and Alternative Hypotheses, v...

A: To test whether the given hypothetical value for the standard deviation is the actual population sta...

Q: 9) A sample of 700 randomly selected workers showed that 400 workers found their jobs through networ...

A: Given that, Sample size n=700 Sample proportion of workers who found their jobs through networking p...

Q: A random sample of the closing stock prices in dollars for a company in a recent year is listed belo...

A: The sample mean is, x¯=∑Xn=20.53+18.99+17.56+19.45+17.18+20.52+18.31+20.93+20.35+18.71+21.06+17.51+1...

Q: For a standard normal distribution, find:P(1.22 < z < 2.54)

A: Given that, P(1.22 < Z < 2.54)

Q: (a) Find a regression relating company sales to the industry sales. (b) Test for significance of reg...

A: (a) The regression analysis is conducted using EXCEL. The software procedure is given below: Enter ...

Q: The average price of homes sold in the U.S. in the past year was $220,000. A random sample of 81 hom...

A: Given Data: Sample mean(x¯)=210000Population Standard deviation(σ)=36000Sample size(n)=81   1) Null ...

Q: Thank you for Advance for quick response.   Best,

A:

Q: Assume that adults were randomly selected for a poll. They were asked if they​ "favor or oppose usin...

A: Given α=0.10           x=485           n=485+395= 883 Given claim: Equal to 0.50 The claim is either...

Q: Using Symmetry and the Empirical Rule A standardized test is approximately normally distributed wi...

A: *The Question is slightly wrong. In order to use the empirical rule the standard deviation should be...

Q: The results of a nationwide Gallup poll concerning a person's race and their opinion on the death pe...

A: Chi - square test :  The test is applied when you have two categorical variables from a single popul...

Q: A local church parish wants to raise money to add to their campus. In a sample from a previous fund ...

A: Given, This is a problem of two sample t-test where we check for differences in the 2 sample outcome...

Q: Ages Number of students Relative Frequency 15-18 9 % 19-22 2 % 23-26 2 % 27-30 6 % 31-34 3...

A: Relative frequency = frequencyTotal Frequency

Q: Find the P-value for the indicated hypothesis test with the given standardized test statistic, z. De...

A: The level of significance is, α=0.02 The value of test statistic is, z =1.65 The type of test is rig...

Q: 8) Trials in an experiment with a polygraph include 96 results that include 22 cases of wrong result...

A: Given: n = sample size = 96 x = number of correct results = 74 Thus,  p^= 74/96 = 0.770833 p0 = 80% ...

Q: In a random sample of ten cell​ phones, the mean full retail price was ​$585.50 and the standard dev...

A: From the given information, Sample size n=10 Sample mean = 585.5 Sample standard deviation = 187   C...

Q: Consider the following time series data.   Week 1 2 3 4 5 6 Value 19 13 16 10 19 15   Using ...

A: Forecasting : Forecasting is a very important part of today's world. Economists forecast interest r...