10/10/23

Give your answer to two decimal places.
If n=18, (x-bar)=32, and s=2, find the margin of error at a 90% confidence levelGive your answer to two decimal places.
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10/09/23

Probability (Statistics)
A particular fruit's weights are normally distributed, with a mean of 529 grams and a standard deviation of 35 grams.If you pick one fruit at random, what is the probability that it will weigh... more
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10/09/23

whats the equation of the parell line to the point of (3,-3) and 2x+3y=15
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10/08/23

Probability Terminology
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. [Round your... more
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10/07/23

How do I test the significance of the difference between two means when the samples are not independent and number of observations is different for each?
Characteristics of data: marketing research study with total sample of 3500 respondents. Topics included ratings of various brands in a product category. But individual brands were rated ONLY by... more
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10/06/23

Suppose that the efficacy of a certain drug is 0.59. Consider the sampling distribution (sample size n = 182) for the proportion of patients cured by this drug
a. What is the mean of this distribution? b. What is the standard error of this distribution? Round the answer to three decimal places.   
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10/06/23

A normal distributed population has the following parameters,

µ = 74.7 and σ = 91.6. If a random sample of size n= 139 is selected, a. What is the mean of the distribution of sample means?b. What is the standard deviation of the distribution of sample means?
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10/06/23

In the country of United States of Heightlandia, the height measurements of ten-year-old children are approximately normally distributed
mean of 55.2 inches, and standard deviation of 2.5 inches.A) What is the probability that a randomly chosen child has a height of less than 59.55 inches?B) What is the probability that a randomly... more
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10/06/23

The uniform distribution of a random variable X is given in the figure below.

From the figure, what is the probability that a randomly selected X is between 0.36 and 1.56? Round your answer to two decimal places.
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10/06/23

If one card is randomly selected from a well-shuffled standard deck of 52 cards, what is the probability that the card selected is not an Ace? Leave your answer as a reduced fraction.
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10/06/23

how many ways can 17 objects be selected 3 at a time

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10/06/23

For 36 unemployed individuals, find the probability that the average time that they found the next job is more than 30 weeks.

A leading magazine (like Barron's) reported at one time that the average number of weeks an individual is unemployed is 28 weeks. Assume that the length of unemployment is normally distributed with... more
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10/05/23

Find the probability that a sample of size n=180 is randomly selected with a mean greater than 151.2. P(X̅ > 151.2) = 
A population of values has a normal distribution with mean=164 and standard deviation=78.3. You intend to draw a random sample of size n=180.Find the probability that a sample of size n=180 is... more
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10/05/23

Find the probability that a single randomly selected value is between 110.1 and 111.2. P(110.1 < X < 111.2) = 
A population of values has a normal distribution with mean=111.2 and standard deviation=5. You intend to draw a random sample of size n=19.Find the probability that a single randomly selected value... more
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10/05/23

If you pick 4 fruit at random, what is the probability that their mean weight will be between 769 grams and 771 grams
A particular fruit's weights are normally distributed, with a mean of 727 grams and a standard deviation of 26 grams.If you pick 4 fruit at random, what is the probability that their mean weight... more
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10/05/23

If 3 items are chosen at random, what is the probability that their mean length is less than 7 inches?
A manufacturer knows that their items have a normally distributed length, with a mean of 8.1 inches, and standard deviation of 2 inches.If 3 items are chosen at random, what is the probability that... more
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10/04/23

How large of a sample size is required?
You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p*= 82%. You would like to be 99% confident that... more
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10/04/23

If you randomly purchase 11 items, what is the probability that their mean life will be longer than 3 years?
A manufacturer knows that their items have a normally distributed lifespan, with a mean of 3.2 years, and standard deviation of 0.7 years.If you randomly purchase 11 items, what is the probability... more
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10/04/23

You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable estimate for the population proportion.

You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable estimate for the population proportion. You would like to be 98% confident that your... more
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10/03/23

Average height of adult men
Adult men have an average height of 69.0 inches with a standard deviation of 2.8 inches. Find the height of a man with a z-score of -0.39. Round your answer to one decimal place.
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10/03/23

Find P9 in a normal distribution
A distribution of values is normal with a mean of 45.9 and a standard deviation of 53.5.Find P9, which is the score separating the bottom 9% from the top 91%.Enter your answer as a number accurate... more
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10/03/23

Heights of 10 year old children
In the country of United States of Heightlandia, the height measurements of ten-year-old children are approximately normally distributed with a mean of 55.6 inches, and standard deviation of 6... more
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10/03/23

PLS HELP algebra 2, linear systems
Note: Enter your answer and show all the steps that you use to solve this problem in the space provided.The length of a rectangle is 8.75 cm more than 3 times the width. If the perimeter of the... more
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10/03/23

Batch of thermometers
Assume that the readings at freezing on a batch of thermometers are normally distributed with a mean of 0°C and a standard deviation of 1.00°C. A single thermometer is randomly selected and tested.... more
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10/03/23

The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped with a mean of 60 ounces and a standard deviation of 6 ounces.

The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped with a mean of 60 ounces and a standard deviation of 6 ounces. Using the Empirical Rule, answer the... more
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