8,918 Answered Questions for the topic statistics

Statistics

10/17/23

I don't understand where you got 1.96 in this problem
Hi,I am totally confused how to find z - which table to get it from or which formula to use in which calculator for confidence intervals. I am guessing it is confidence intervals that is being... more
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Statistics

10/17/23

Use this to predict the number of situps a person who watches 12 hours of TV can do (to one decimal place)
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

10/17/23

Based on this, construct a 99% confidence interval for the true population mean watermelon weight.
You measure 21 watermelons' weights, and find they have a mean weight of 67 ounces. Assume the population standard deviation is 10.9 ounces. Based on this, construct a 99% confidence interval for... more
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Statistics

10/17/23

Find the margin of error at a 90% confidence level.
In a survey, 22 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $46 and standard deviation of $9. Find the margin of... more
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Statistics

10/17/23

Help with Stats
The population of weights of a particular fruit is normally distributed, with a mean of 432 grams and a standard deviation of 30 grams. If 4 fruits are picked at random, then 14% of the time,... more
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Statistics Math Business Algebra 2

10/17/23

Wall Street Journal reported on several studies that show massage therapy has a variety of health benefits & it's not too expensive.

A sample of 10 typical 1 hr massage therapy sessions showed an average charge of $61. The population standard deviation for a one-hour session is σ = $5.6. Using 95% confidence, what is the margin... more
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Statistics Math Business Algebra 2

10/17/23

Exponential Probability Distribution: The time between arrivals of vehicles at a particular intersection follows an exponential probability distribution with a mean of 13 seconds.
What is the probability that the arrival time between vehicles is 12 seconds or less (to 4 decimals)? What is the probability that the arrival time between vehicles is 6 seconds or less (to 4... more
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Statistics Math Business Calculus

10/17/23

Relationships of Probability
High school seniors with strong academic records apply to the nation’s most selective colleges in greater numbers each year. Because the number of slots remains relatively stable, some colleges... more
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Statistics

10/16/23

answer to quest
Suppose the mean income of firms in the industry for a year is 65 million dollars with a standard deviation of 1 million dollars. If incomes for the industry are distributed normally, what is the... more
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Statistics Probability

10/16/23

I need help with this question please?
Find the indicated probability using the Central Limit Theorem. From 1975 through 2020, the mean annual gain of the Dow Jones Industrial Average was 652 . A random sample of 33 years is selected... more
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Statistics

10/16/23

Based on this, what is the maximal margin of error associated with a 99% confidence interval for the true population mean dog weight.
You measure 35 dogs' weights, and find they have a mean weight of 78 ounces. Assume the population standard deviation is 2.8 ounces. Based on this, what is the maximal margin of error associated... more
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Statistics

10/16/23

Find the 98% confidence interval for a sample of size 416 with a mean of 54.3 and a standard deviation of 13.4.

Assume that a sample is used to estimate a population mean. Find the 98% confidence interval for a sample of size 416 with a mean of 54.3 and a standard deviation of 13.4. Enter your answer as a... more
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Statistics

10/16/23

Find the margin of error at a 90% confidence level.
In a survey, 14 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $43 and standard deviation of $7. Find the margin of... more
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Statistics Probability

10/16/23

I need help with this question please?
Assume that adults have IQ scores that are normally distributed with a mean of 101.5 and a standard deviation 21.4 . Find the first quartile Q_(1), which is the IQ score separating the bottom 25%... more
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Statistics

10/16/23

Probability binomial distribution

The probability of buying a movie ticket with popcorn is 0.761, and the probability of buying a movie ticket without popcorn is 0.239. If you buy 24 movie tickets we want to know the probability... more
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Statistics

10/16/23

standard deviation
A coin-operated coffee machine made by BIG Corporation was designed to discharge a mean of eight ounces of coffee per cup. If it dispenses more than that on average, the corporation may lose money,... more
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Statistics

10/16/23

confidence intrerval
In a random sample of 400 students at a university, 328 stated that they were nonsmokers. Based on this sample, compute a 99% confidence interval for the proportion of all students at the... more
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Statistics

10/16/23

normally distributed
A certain brokerage house wants to estimate the mean daily return on a certain stock. A random sample of 9 days yields the following return percentages.-1.6, -2.35, -2.3, 1.79, 1.01, -0.82, -2.66,... more
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Statistics

10/15/23

standard deviation
The breaking strengths of cables produced by a certain manufacturer have a standard deviation of 108 pounds. A random sample of 50 newly manufactured cables has a mean breaking strength... more
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Statistics

10/15/23

non-normally distribution
We want to conduct a hypothesis test of the claim that the population mean score on a nationwide examination in anthropology is different from 497. So, we choose a random sample of exam scores. The... more
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Statistics Math

10/13/23

statistics Chapter 7
Suppose that a category of world class runners are known to run a marathon (26 miles) in an average of 147 minutes with a standard deviation of 14 minutes. Consider 49 of the races.Find the median... more
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Statistics Math

10/13/23

statistics chapter 7
Salaries for teachers in a particular elementary school district are normally distributed with a mean of $42,000 and a standard deviation of $6,400. We randomly survey ten teachers from that... more
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Statistics

10/13/23

Sampling Distributions
A fair coin is tossed n = 80 times. Let p̂ be the sample proportion of heads. Find P(0.41 < p̂ < 0.63). (Round your answer to four decimal places.)P(0.41 < p̂ < 0.63) =
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Statistics

10/13/23

Confidence Interval
Find the necessary confidence interval for a population mean 𝜇 for the following values. (Round your answers to two decimal places.)𝛼 = 0.01, n = 36, x = 31, s2 = 13
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Statistics

10/13/23

If n=580 and p^ (p-hat) = 0.67, construct a 95% confidence interval.
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