8,918 Answered Questions for the topic statistics

Statistics

07/29/22

please help! Due tonight!
Out of 300 people sampled, 162 had kids. Based on this, construct a 90% confidence interval for the true population proportion of people with kids.Give your answers as decimals, to three... more
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Statistics

07/29/22

Please help! due tonight and I am stumped
In a recent Super Bowl, a TV network predicted that 74 % of the audience would express an interest in seeing one of its forthcoming television shows. The network ran commercials for these shows... more
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Statistics

07/29/22

Statistics and Probablity
The college Physical Education Department offered an Advanced First Aid course last summer. The scores on the comprehensive final exam were normally distributed, and the Z scores for some of the... more
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Statistics

07/29/22

prob. normal distribution
Slices of pizza for a certain brand of pizza have a mass that is approximately normally distributed with a mean of 66.1 grams and a standard deviation of 1.97 grams.c) What is the probability of... more
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Statistics Math

07/28/22

90% Confidence Interval for True Population Proportion
Suppose a mobile phone company wants to determine the current percentage of customers aged 50+ who use text messaging on their cell phones. How many customers aged 50+ should the company survey in... more
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Statistics

07/28/22

fully mediation or not?
I am using Process Marco Mediation ModelThe results are as follows:X-->Y total effect is not significant (c path= -.06, P=.109)X--> M significant (a path= -.34, p=000) M--> Y ... more
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Statistics

07/27/22

Standard Deviation Rule
The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped. The widget weights have a mean of 55 ounces and a standard deviation of 3 ounces.Use the Standard Deviation... more
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Statistics

07/27/22

Stat - Confidence Intervals
The Human Toxome Project (HTP) is working to understand the scope of industrial pollution in the human body. Industrial chemicals may enter the body through pollution or as ingredients in consumer... more
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Statistics

07/27/22

Statistics Confidence Intervals - Population Mean no Given
The population standard deviation for the age of YZ College students is 15 years. If we want to be 95% confident that the sample mean age is within two years of the true population mean age of YZ... more
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Statistics Math

07/27/22

Math problem question ( Please help me)
The data below illustrates Canada's median age as a relation to time.Year Median Age1911 23.81921 23.91931 24.71941 271951 27.71961 26.31971 26.21981 29.61991 33.52001 37.6 b.Find the algebraic... more
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Statistics Math

07/26/22

Math Problem question
Paolina has is an artist that can create 18 math paintings per day. Someone iswilling to pay Paolina $35/paints plus $1000 bonus.a. Find an algebraic expression that relates the number of paintings... more
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Statistics Math

07/26/22

Given 𝑓(𝑥) = 1/2𝑥+1 and g(x) = 3x – 1, determine (f • g)(x) and its domain.
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Statistics Math

07/26/22

You can jog at a constant speed of 6 km/h. If you can burn 1200 calories per 1800m, find how many calories you can burn jogging for 1.5 hours (find a composite function first).
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Statistics Math

07/26/22

If f(x) = sinx and g(x) = cosx, what is the impact when these functions are divided to form a compound function such as h(x) = f(x)/g(x) = sin(x)/cos(x). Explain.
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Statistics Math

07/26/22

Explain how the maxima and minima of f(x) = sinx, g(x) = sin(2x) and h(x) = sin(3x) affect the shape of k(x) = sin(x) + sin(2x) + sin(3x). You are adding the y-values of the function together.
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Statistics

07/25/22

Please Help Me!!!
You are the operations manager for an airline and you are considering a higher fare level for passengers in aisle seats. How many randomly selected air passengers must you​ survey? Assume that you... more
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Statistics

07/23/22

A highschool baseball player has a 0.32 batting average. In one game he gets 9 at bats. What is the probability he will get at least 3 hits in the game?
Round the answer to 3 decimal places
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Statistics Math

07/23/22

Confidence Intervals for Population Means

Assume that a sample is used to estimate a population mean μμ. Find the 80% confidence interval for a sample of size 544 with a mean of 20.6 and a standard deviation of 20.8. Enter your answer as a... more
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Statistics

07/23/22

Use this to predict the number of situps a person who watches 10.5 hours of TV can do.
A regression was run to determine if there is a relationship between hours of TV watched per day (x) and number of situps a person can do (y).The results of the regression... more
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Statistics

07/21/22

Math Question #8
The lengths of pregnancies in a small rural village are normally distributed with:μ= 264    σ=σ= 12In what range would you expect to find the middle 68% of most... more
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Statistics Math

07/21/22

Statistics - Required Sample Size for a Given Error
I solved following question, but I'm not sure whether I've taken the right approachAny help is highly appreciated!Question:An article in the Journal of Agricultural Science [“The Use of Residual... more
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Statistics

07/21/22

Math Question #6
Suppose we take a sample of size 229 from a population with p = 0.71.What is the standard deviation of the sampling distribution? Part 2:Suppose you want to lower the standard deviation to 0.01,... more
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Statistics

07/21/22

Math Question #5
A manufacturer knows that their items have a lengths that are skewed right, with a mean of 8.6 inches, and standard deviation of 2.6 inches.If 41 items are chosen at random, what is the probability... more
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Statistics

07/21/22

Math Question #5
A particular fruit's weights are normally distributed, with a mean of 511 grams and a standard deviation of 29 grams.If you pick 25 fruits at random, then 10% of the time, their mean weight will be... more
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Statistics

07/21/22

Math Question #4
Based on historical data, your manager believes that 42% of the company's orders come from first-time customers. A random sample of 165 orders will be used to estimate the proportion of... more
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