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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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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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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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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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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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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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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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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10/16/23

Writing Slope-Intercept Form Practice
Rufus collected 100 pounds of aluminum cans to recycle. He plans to collect an additional 25 pounds each week. Write the equation for the total pounds, p, of aluminum cans after w weeks. What does... more
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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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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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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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10/13/23

Algebra Question

The population of the world in 1987 was 5 billion and the annual growth rate was estimated at 2 percent per year. Assuming that the world population follows an exponential growth model, find the... more
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10/13/23

College algebra question

The population of the world in 1987 was 5 billion and the annual growth rate was estimated at 2 percent per year. Assuming that the world population follows an exponential growth model, find the... more
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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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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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10/13/23

If n=580 and p^ (p-hat) = 0.67, construct a 95% confidence interval.
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10/12/23

Statistics Chapter 7
Suppose that the duration of a particular type of criminal trial is known to have a mean of 21 days and a standard deviation of 7 days. We randomly sample 9 trials.Ninety percent of the total of 9... more
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10/12/23

Statistics Chapter 7
Salaries for teachers in a particular elementary school district are normally distributed with a mean of $43,000 and a standard deviation of $6,400. We randomly survey ten teachers from that... more
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10/12/23

PLS HELP!! Algebra 2, matrices
If A=[2 8 3] [-1 0 5] [-1 5 2]and B=[0 3 -2], what is 4A+3B? Solve algebraically, showing all steps.
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10/12/23

PLS HELP! Algebra 2, matrices
Find the values of the variables.[−10 -w^2] [2k -64] =[2f 3] [-20 3]
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10/11/23

Math question plz help
Find three consecutive odd integers such that 4 times the second decreased by the third is the same two more than the first.
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10/11/23

Ashley had 181 dollars to begin with. She just spent c dollars. Using c , write an expression for the number of dollars she has left.
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10/11/23

How large of a sample size is required?
You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately =59.3. You would like to be 99% confident that... more
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10/10/23

Enter your answer as an open-interval (i.e., parentheses) accurate to one decimal place (because the sample statistics are reported accurate to one decimal place).
Assume that a sample is used to estimate a population mean. Find the 90% confidence interval for a sample of size 59 with a mean of 48.3 and a standard deviation of 17.9. Enter your answer as... more
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