8,918 Answered Questions for the topic statistics

Statistics

02/26/24

Intro to Stats and Analytics

Suppose that wedding costs in the Caribbean are normally distributed with a mean of $7000 and a standard deviation of $950. Using the Empirical rule below, estimate the percentage of Caribbean... more
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Statistics

02/26/24

Intro to Stats and Analytics

In a mid-size company, the distribution of the number of phone calls answered each day by each of the 12 receptionists is bell-shaped and has a mean of 35 and a standard deviation of 9. Using the... more
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Statistics

02/26/24

Intro to Stats and Analytics
A company has a policy of retiring company cars; this policy looks at number of miles driven, purpose of trips, style of car and other features. The distribution of the number of months in service... more
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Statistics

02/26/24

Intro to Stats and Analytics

The physical plant at the main campus of a large state university recieves daily requests to replace florecent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a... more
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Statistics

02/26/24

Mr. Abu has a box of 7 blue marbles and 3 red marbles. 2 marbles were selected randomly without replacement. What is the possibility that,
(1) Both marbles were blue(2) both marbles were red.(3) The first marble was blue and the second marble was red.
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Statistics

02/26/24

Please help with this question

In a sample of 330 adults, 241 head children. Constructed 90% confidence and evolve for the true population proportion of adults with children. Give your answer as decimals 23 places.... more
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Statistics

02/26/24

Statistic Question
The time to complete an exam is approximately Normal with a mean of 42 minutes and a standard deviation of 3 minutes.The bell curve below represents the distribution for testing times. The scale on... more
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Statistics

02/25/24

Probability and statistics

Females have mean weight of 78.6kg with standard deviation of 5.03 kg. 1. 20% of females weigh less than t kg. Find value of t , to 2 decimal places2. Middle 90% of males weigh between an and b kg.... more
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Statistics Writing Spss

02/25/24

Cronbach alpha for Survey question with Select all that applies.
Hi!I have a survey questionnaire with 15 items, all of them are multiple choice questions. This is composed of 11 items with Select all that applies and 4 items with only to choose one question... more
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02/24/24

I need urgent help with figuring out some statistical test for my biology experiment!
So I tested the inhibitory effect of 2 essential oils on bacteria at 5 different concentrations increasing by 20% beginning with 10% and ending at 90%. Thus, the first independent variable is the... more
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Statistics

02/23/24

Help with math homework

Use the following sample to estimate a population mean . 74.6 65.9 76.1 57.3 65.9 74.4 Assuming the population is normally distributed, find the 99.5% confidence interval about the population... more
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Statistics

02/23/24

I need help with homework question 4
A researcher must estimate the mean temperature (in degrees Fahrenheit) with the following sample temperatures 23.824.640.536.122.631.913.8assuming the population of temperatures are normally... more
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Statistics

02/23/24

I need help with a homework question

Assuming the population has an approximate normal distribution if a sample size n=10 has a sample mean x = 38 with a sample standard deviation s=2 find the margin error at a 95% confidence level.... more
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Statistics

02/22/24

Could Someone Please Help With This Statistics Problem?
A group of researchers is studying the relationship between cortisol (stress hormone) levels and memory, and they want to see if a sample of 100 adults that has been recruited is a good... more
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02/22/24

How to do a two-way ANOVA, followed by Tukey's HSD test for a biology experiment?

So I'm trying to see the effect of 2 different types of essential oils (rosemary and ginger) on E. coli. What I did was that I increased the concentrations of the oils and I used the disk diffusion... more
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02/21/24

i'm stuck trying to figure out how to do the statistical test for my biology experiment
So I'm trying to see the effect of 2 different types of essential oils (rosemary and ginger) on e.coli. What I did was that I increased the concentrations of the oils and I used the disk diffusion... more
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Statistics

02/21/24

Will Someone Please Help Me Solve This Statistics Question?
Use two separate groups to create two population mean estimates (and let's assume the population is normally distributed). Ask a group of friends how much time (in hours) they spent on social media... more
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Statistics

02/21/24

Excel, Data and decisions
What formula is used to calculate the z-score corresponding to the 75th percentile in a standard normal distribution in Excel?
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Statistics

02/20/24

intro to stats and analytics

According to Masterfoods, the company that manufactures M&M’s, 12% of peanut M&M’s are brown, 15% are yellow, 12% are red, 23% are blue, 23% are orange and 15% are green. You randomly... more
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Statistics

02/20/24

Intro to stats and anayltics

If a seed is planted, it has a 80% chance of growing into a healthy plant.If 7 seeds are planted, what is the probability that exactly 2 don't grow?Round your answer to 4 decimal places.Can you... more
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Statistics

02/20/24

Question below. Thanks for the help.

The population of weights of a particular fruit is normally distributed, with a mean of 406 grams and a standard deviation of 35 grams. If 9 fruits are picked at random, then 11% of the time, their... more
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Statistics

02/20/24

Question below. Thanks for the help.

The population of weights of a particular fruit is normally distributed, with a mean of 406 grams and a standard deviation of 35 grams. If 9 fruits are picked at random, then 11% of the time, their... more
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Statistics

02/19/24

I need help with this question
A manufacturer knows that their items have a normally distributed lifespan with a mean of 2.5 years and a standard deviation of 0.5 years the 5% of items with the shortest lifespan will last less... more
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Statistics

02/19/24

I need help with this statistics and probability question
In the country of the United States of height, Landia, the height measurements of 10 year old children are approximately normally distributed with a meaning of 55.9 inches in a standard deviation... more
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Statistics

02/19/24

I need help with statistics
A food marketing Institute found that 33% of households spend more than $125 a week on groceries assume the population proportion is 0.33 and a simple random sample of 412 households is selected... more
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