8,918 Answered Questions for the topic statistics

Statistics

10/22/23

Assume the random variable X is normally​ distributed, with mean 60 and standard deviation 5 . Find the 6th percentile.
Follows • 1
Expert Answers •1
Statistics

10/22/23

The confidence interval
The confidence interval for the population variance isC=0.98, s2=7.84, n=27
Follows • 1
Expert Answers •1
Statistics

10/21/23

What's the answer?
Michael is putting 11 colored light bulbs into a string of lights. There are 3 pink light bulbs, 4 orange light bulbs, and 4 green light bulbs. How many distinct orders of light bulbs are there if... more
Follows • 1
Expert Answers •1
Statistics

10/20/23

For a standard normal distribution, find: P(z > 2.14)
Follows • 1
Expert Answers •1
Statistics

10/20/23

The average time between accidents in a factory is 14 weeks. Find the probability that more than 17 weeks pass between accidents.
Follows • 0
Expert Answers •1
Statistics

10/20/23

How to find point estimate mean and SD
The National Football League (NFL) polls fans to develop a rating for each football game (NFL website, October 24, 2012). Each game is rated on a scale from  (forgettable) to  (memorable). The fan... more
Follows • 1
Expert Answers •1
Statistics Probability

10/20/23

Probability four decimal places

assume that when adults with smartphones are randomly selected 49% use them in meetings or classes if 8 adult smartphone users are randomly.selected find the probability that exactly 6 of them use... more
Follows • 1
Expert Answers •1
Statistics

10/19/23

Average SAT scores of first-year students?
SAT scores are normally distributed with a mean of 1,500 and a standard deviation of 300. An administrator at a college is interested in estimating the average SAT score of first-year students. If... more
Follows • 1
Expert Answers •1
Statistics Math

10/19/23

Find the p value and whether or not the null hypothesis will be rejected at a significance level of 0.5 (see description)
A. H0: µ≤60H1:µ>60Test statistic of 2.35B. H0: µ≥42H1: µ<42Test statistic of -1.13C. H0: µ=88H1: µ≠88
Follows • 2
Expert Answers •1
Statistics

10/18/23

STI survey funded by the U of Washington School of Medicine
In a survey funded by the University of Washington School of Medicine, 600 of 1,500 adult Seattle residents said they did not believe they could come down with a sexually transmitted infection... more
Follows • 1
Expert Answers •1
Statistics

10/18/23

People with children
Out of 300 people sampled, 255 had children. Based on this, construct a 95% confidence interval for the true population proportion of people with children.  What is the 90% confidence interval to... more
Follows • 1
Expert Answers •1
Statistics

10/18/23

Average SAT scores of first-year students
SAT scores are normally distributed with a mean of 1,500 and a standard deviation of 300. An administrator at a college is interested in estimating the average SAT score of first-year students. If... more
Follows • 1
Expert Answers •1
Statistics

10/18/23

Confidence level margin of error
Assuming the population has an approximate normal distribution, if a sample size n = 12 has a sample mean x-bar = 47 with a sample standard deviation s = 6, find the margin of error at a 98%... more
Follows • 1
Expert Answers •1
Statistics

10/18/23

Mean temperature
A researcher must estimate the mean temperature (in degrees Fahrenheit) with the following sample temperatures: 44.5, 49.5, 46.9, 62.7, 64.7, 50.3. Assuming the population of temperatures are... more
Follows • 1
Expert Answers •1
Statistics

10/18/23

Population normal distribution

Assuming the population has an approximate normal distribution, if a sample size n=21 has a sample mean x-bar=37 with a sample standard deviation s=6, find the margin of error at an 80% confidence... more
Follows • 1
Expert Answers •1
Statistics

10/18/23

High temperatures in 10 small towns
The high temperatures (in degrees Fahrenheit) of a random sample of 10 small towns are 97.3, 98.4, 98.5, 96.6, 96.9, 98.9, 98, 97.6, 99, 97.2. Assume high temperatures are normally distributed.... more
Follows • 1
Expert Answers •1
Statistics

10/18/23

Confidence Interval for Population Mean Estimation
The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 34.3 mmHg (millimeters of mercury) for a sample... more
Follows • 2
Expert Answers •1
Statistics

10/18/23

Confidence Interval Sample Size
We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers believe the population standard deviation is approximately s=56.5. We would like to be 95%... more
Follows • 1
Expert Answers •1
Statistics

10/18/23

Based on this, construct a 95% confidence interval for the true population mean turtle weight.
You measure 41 turtles' weights, and find they have a mean weight of 70 ounces. Assume the population standard deviation is 8 ounces. Based on this, construct a 95% confidence interval for the true... more
Follows • 1
Expert Answers •1
Statistics Probability

10/18/23

I need the answer to this please?
Determine the area under the standard normal curve that lies to the left of (a) Z=-1.67, (b) Z=-1.35, (c) Z=-1.69, and (d) Z=-0.93.
Follows • 1
Expert Answers •1
Statistics Math Business Algebra 2

10/18/23

The time married men with children spend on child care averages 6.5 hours per week.

You belong to a professional group on family practices that would like to do its own study to determine if the time married men in your area spend on child care per week differs from the reported... more
Follows • 1
Expert Answers •1
Statistics

10/18/23

Find standard deviation in years
The average age of passenger cars is 19.4 years. If the distribution of ages is normal and 9% of the cars are older than 22.1 years find the standard deviation. Round z-value to 2 decimal places.
Follows • 2
Expert Answers •1
Statistics Math Business Algebra 2

10/18/23

According to statistics reported on CNBC, a surprising number of motor vehicles are not covered by insurance.
Sample results, consistent with the CNBC report, showed 26 of 181 vehicles were not covered by insurance.a. What is the point estimate of the proportion of vehicles not covered by insurance (to 4... more
Follows • 1
Expert Answers •1
Statistics

10/18/23

Continuous Probability Distribution Question
The probability density of a random variable X is given in the figure below.From this density, the probability that X > 1.18 or X < 0.34 is: ___________
Follows • 1
Expert Answers •1
Statistics Probability

10/17/23

I need an answer to this question please?
An elevator has a placard stating that the maximum capacity is 4100lb-27 passengers. So, 27 adult male passengers can have a mean weight of up to 4100/27=152 pounds. Assume that weights of males... more
Follows • 1
Expert Answers •1

Still looking for help? Get the right answer, fast.

Ask a question for free

Get a free answer to a quick problem.
Most questions answered within 4 hours.

OR

Find an Online Tutor Now

Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.