8,918 Answered Questions for the topic statistics

Statistics

04/11/22

The Acme Company manufactures widgets
The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped. The widget weights have a mean of 51 ounces and a standard deviation of 7 ounces.Use the Empirical Rule,... more
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Statistics

04/11/22

Pointless Survey at Costco
In a relatively pointless survey, the following data was collected on cars in a Costco parking lot: there were 35 orange cars; 38 green cars; 23 purple cars; 27 white cars; 86 red cars; 19 cars of... more
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Statistics

04/11/22

Estimating Population Standard Deviation or Va
A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the​ drug, 17 subjects had a mean wake time of 90.8 min and a... more
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04/11/22

What is the approximate percentage of light-bulb replacement requests numbering between 45 and 65?
The physical plant at the main campus of a large state university receives daily requests to replace florescent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a... more
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Statistics

04/10/22

Approximately normally distributed with a mean of 53.8 in, and standard deviation of 2.1 in. What is the probability that the height of a randomly chosen child is between 52.55 and 54.25 in?

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Statistics Math Algebra 1 Algebra 2

04/10/22

Two dice are rolled. Determine the probability of the following. Rolling an even number or a number greater than 10.
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Statistics

04/10/22

Find critical value and critical region.
A 0.05 significance level is used for a hypothesis test of the claim that when parents use a particular method of gender​ selection, the proportion of baby girls is less than 0.5. Assume that... more
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Statistics

04/09/22

Find test statistics value, p- value, critical value and critical region.
A 0.05 significance level is used for a hypothesis test of the claim that when parents use a particular method of gender​ selection, the proportion of baby girls is less than 0.5. Assume that... more
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Statistics

04/09/22

Find statistic test and p-value

In a study of the accuracy of fast food drive -through orders, onerestaurant had 30 orders that were not accurate among 372orders observed. Use a 0.10 significance leve to 10%. Does theaccuracy... more
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Statistics

04/09/22

95% show up only for a flight of the time. Airline can fit 40 pax at $4000 but sells 42 tickets. What is the expected value of x? What is the interpretation of this value?
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Statistics Probability

04/08/22

I need help with probability statistics!!
The lengths of births in a small rural village are normally distributed with a mean of 269 days and a standard deviation of 15 days.In what range would you expect to find the middle 98% of most... more
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Statistics

04/07/22

An apple a day.
 An apple a day: A supermarket sells apples in bags labeled as weighing 10 pounds A sample of 50 bags: had a mean weight of 10.3 pounds with standard deviation of 0.1 pound. Someone wants to know... more
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Statistics

04/07/22

help with this problem
In the country of United States of Heightlandia, the height measurements of ten-year-old children are approximately normally distributed with a mean of 53.3 inches, and standard deviation of 1... more
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Statistics

04/07/22

i need help solving this

A population of values has a normal distribution with μ=51.5 and σ=89.2. You intend to draw a random sample of size n=215. Please show your answers as numbers accurate to 3 decimal places.Find the... more
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Statistics

04/06/22

Based on a sample of 800 people, 26% owned cats. The p-value is?
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Statistics

04/06/22

Find the area of the shaded region.

The graph to the right depicts IQ scores of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15Between 106 and 128
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Statistics

04/06/22

Sketch region and find probability

mean of 0 and a standard deviation of 1. Draw a graph and find the probability of a bone density test score greater than 0
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Statistics

04/06/22

Sketch region and find probability

mean of 0 and a standard deviation of 1 Draw a graph and find the probability of a bone density test score between -2.12 and 2.12
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Statistics

04/06/22

Find the probability of selecting a class that runs between 51.25 and 51.5 minutes.
A statistics professor plans classes so carefully that the lengths of her classes are uniformly distributed between 49.0 and 54.0 minutes. Find the probability that a given class period runs... more
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Statistics

04/05/22

If Air Force only accepts someone who is at top 15%, what is his minimum required height?
If Air Force only accepts someone who is at top 15%, what is his minimum required height?mean = 70 inches standard deviation = 2.5 inches
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Statistics

04/05/22

Please help me find How many of the 15 students do we expect to attend the festivities? (Round your answer to the nearest whole number.)
A school newspaper reporter decides to randomly survey 15 students to see if they will attend Tet (Vietnamese New Year) festivities this year. Based on past years, she knows that 13% of students... more
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Statistics

04/05/22

Which of the following correlation coefficient represents the most linear function? A 0.976 B 0.001. C- 0.002 D - 0989
Which of the following correlation coefficient represents the most linear function?A 0.976B 0.001.C- 0.002D - 0989
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Statistics

04/05/22

What is the probability
Studies have shown that girls at age 3 have heights that are normally distributed with a mean of 37 inches and a standard deviation of 3.5 inches. c. What is the probability that a 3-year-old girl... more
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Statistics

04/04/22

Find Upper and Lower Bounds on CI
Do male and female servers work the same number of hours? A sample of 21 female servers worked an average of 33 hours per week, with a standard deviation of 2. A sample of 24 male servers worked an... more
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Statistics

04/04/22

please help me find the standard deviation of this question
The Higher Education Research Institute at UCLA collected data from 203,967 incoming first-time, full-time freshmen from 270 four-year colleges and universities in the U.S. 71.4% of those students... more
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