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Statistics

04/27/23

90% confidence interval

The distribution of blood cholesterol level in the population of young men aged 20 to 34 years is close to Normal with standard deviation 𝜎 = 45 milligrams per deciliter (mg/dL). You measure the... more

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Statistics

04/27/23

Out of 600 people sampled, 222 had kids. Based on this, construct a 90% confidence interval for the true population proportion of people with kids.

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Statistics Probability

04/27/23

If 4 of these CDs are randomly selected for testing, what is the probability that the entire batch will be accepted?

With one method of a procedure called acceptance sampling, a sample of items is randomly selected without replacement and the entire batch is accepted if every item in the sample is okay. The ABC... more

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Statistics

04/26/23

Standard normal curve

For a standard normal curve, find the area between z = 0.40 and z = 1.98. (Use 4 decimal places.)Find the positive z value such that 80% of the standard normal curve lies between –z and z. (Use 2... more

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Statistics

04/26/23

P-value from simple random sample

Assume that a simple random sample has been selected from a normally distributed population. Find the P-value for a claim of 𝜇 = 5. Express answer to 3 decimal places.Sample data: n = 81, x =... more

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Statistics Math Econometrics Civil Engineering

04/26/23

A man borrowed an amount of P150,600 to bank that offers an interest rate of 5.36% compounded continuously and has a maturity date of 6 years.

A man borrowed an amount of P150,600 to bank that offers an interest rate of 5.36% compounded continuously and has a maturity date of 6 years. He plans to pay the loan at an amount of P15,800 at... more

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Statistics Math Econometrics Civil Engineering

04/26/23

A series of cash flows are established on an account as listed below:

A series of cash flows are established on an account as listed below: Payment of P375 at the end of the 2nd, 5th, and 7th year at an interest rate of 9% compounded semi-annually. Payment of P220 at... more

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Statistics Math Econometrics Civil Engineering

04/26/23

On the day his grandson was born, a man deposited to a trust company a sufficient amount of money so that the boy could receive five annual payments of P10,000 each for his college tuition fees

On the day his grandson was born, a man deposited to a trust company a sufficient amount of money so that the boy could receive five annual payments of P10,000 each for his college tuition fees,... more

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Statistics Math Econometrics Civil Engineering

04/26/23

Mark borrowed an amount of P8,830 from Brian and after 2 years, he borrowed again an amount of P2,750.

Mark borrowed an amount of P8,830 from Brian and after 2 years, he borrowed again an amount of P2,750. He paid P3,600 one year after the last borrow, P2,450 the following year, and P1,800 the next... more

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Statistics Math Econometrics Civil Engineering

04/26/23

On the day his son was born, a father deposited to a trust company a sufficient amount of money so that his son could receive money in the future.

On the day his son was born, a father deposited to a trust company a sufficient amount of money so that his son could receive money in the future. There was a provision that the son can withdraw an... more

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Statistics

04/26/23

What is the probability that X is greater than 113.88?

Suppose that X is normally distributed with; mean = 90 and standard deviation = 12. What is the probability that X is greater than 113.88? Probability = ___

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Statistics

04/26/23

Consider a normal distribution curve ...

Consider a normal distribution curve where the middle 30 % of the area under the curve lies above the interval ( 7 , 15 ). Use this information to find the mean, (μ) , and the standard... more

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Statistics

04/25/23

Standard deviation

Find the standard deviation for the following sample data: 57.2 57.9 61.4 69.8 59.0 64.7 70.1 64.7 53.5 78.2

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Statistics

04/25/23

sample mean for data set

The sample mean for a data set is 0.1315, where n = 112 and s = 16.70. Find the test statistic for the claim: 𝜇 > 0.10.Express to 3 decimal places.

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Statistics

04/25/23

The test statistic (z) is -1.30 what is the rejection region? (what is z> ? and what is z<?

An experimenter has prepared a drug-dose level that he claims will induce sleep for at least 70% of people suffering from insomnia. After examining the dosage we feel that his claims regarding the... more

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Statistics

04/25/23

margin of error

Find the margin of error in estimating the population mean:confidence level = 94%sample size = 86sample mean = 113.5standard deviation = 12.7

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Statistics

04/24/23

null & alternative hypothesis

A cereal company claims that the mean weight of the cereal in its packets is at least 14 oz. Identify both the null and alternative hypothesis.H0: 𝜇 > 14 and H1: 𝜇 ≤ 14H0: 𝜇 ≥ 14 and... more

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Statistics

04/24/23

Find the test statistic and rejection region

An experimenter has prepared a drug-dose level that he claims will induce sleep for at least 70% of people suffering from insomnia. After examining the dosage we feel that his claims regarding the... more

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Statistics

04/24/23

and 30 are found to be infested with whitefly

Suppose that 10% of the fields in a given agricultural area are infested with the sweet potato whitefly. One hundred fields in this area are randomly selected, and 30 are found to be infested with... more

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Statistics

04/24/23

the batting order for eight players on a 10 person team

the batting order for eight

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Statistics

04/24/23

statistics binomial probability

If a seed is planted, it has a 60% chance of growing into a healthy plant.If 7 seeds are planted, what is the probability that exactly 2 don't grow?

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Statistics Probability

04/24/23

6. Suppose you know that the population standard deviation of a characteristic of interest is….

Suppose you know that the population standard deviation of a characteristic of interest is 13.6. What sample size would be required to estimate the population mean with an error that is less than 5... more

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Statistics Probability

04/24/23

Assume that a certain tire manufacturer produces …….

Assume that a certain tire manufacturer produces a new tire. Tests show that the number of miles these tires last before blow-out seems to have a normal distribution with a mean of 60,000 miles and... more

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Statistics Math

04/23/23

A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO, p, is less than 5%. Identify the Type II error in this context.

A) The error of accepting the claim that the true proportion is at least 5% when it really is at least 5%.B) The error of accepting the claim that the true proportion is at least 5% when it is... more

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Statistics

04/22/23

We compare two sample variances to determine whether the difference between them is probably not due to random sampling error when we perform a ______.

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90% confidence interval

Out of 600 people sampled, 222 had kids. Based on this, construct a 90% confidence interval for the true population proportion of people with kids.

If 4 of these CDs are randomly selected for testing, what is the probability that the entire batch will be accepted?

Standard normal curve

P-value from simple random sample

A man borrowed an amount of P150,600 to bank that offers an interest rate of 5.36% compounded continuously and has a maturity date of 6 years.

A series of cash flows are established on an account as listed below:

On the day his grandson was born, a man deposited to a trust company a sufficient amount of money so that the boy could receive five annual payments of P10,000 each for his college tuition fees

Mark borrowed an amount of P8,830 from Brian and after 2 years, he borrowed again an amount of P2,750.

On the day his son was born, a father deposited to a trust company a sufficient amount of money so that his son could receive money in the future.

What is the probability that X is greater than 113.88?

Consider a normal distribution curve ...

Standard deviation

sample mean for data set

The test statistic (z) is -1.30 what is the rejection region? (what is z> ? and what is z<?

margin of error

null & alternative hypothesis

Find the test statistic and rejection region

and 30 are found to be infested with whitefly

the batting order for eight players on a 10 person team

statistics binomial probability

6. Suppose you know that the population standard deviation of a characteristic of interest is….

Assume that a certain tire manufacturer produces …….

A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO, p, is less than 5%. Identify the Type II error in this context.

We compare two sample variances to determine whether the difference between them is probably not due to random sampling error when we perform a ______.

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