In a two-tailed test about the population mean, where the population standard deviation is known, a sample of size 40 was taken. Use 10% significance. Find the critical value(s).

Q: The weights of salmon grown commercially are normally distributed with a standard deviation of 1.2…

A: Given information Sample mean = 7 pounds Population mean = 7.6 Sample size = 16 Population Standard…

Q: Assuming that IQ is normally distributed with a mean of 100 and a standard deviation of 15, describe…

A: According to central limit theorem, for large sample (>30) or if the population follows normal…

Q: In one region of the Caribbean Sea, daily water temperatures are normally distributed with a mean of…

A: It is given that the mean is 77.9 and standard deviation is 2.4.

Q: The bell company manufactures laptop computers. A study indicates that the life spans of their…

A: Here, The bell company manufactures laptop computers. A study indicates that the life spans of their…

Q: A population of normally distributed data has a mean of 200 and a standard deviation of 20. Assuming…

A:

Q: What is the formula for calculating standard deviation of npv?

A: NPV is Net Present Value.

Q: The Bell Company manufactures laptop computers. A study indicates that the life spans of their…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the mean…

Q: For what is the Expected Population Deviation (error) Rate used?

A: Expected population error rate: The expected rate of error in the population is called expected…

Q: Use the values below to compute the sample standard deviation. Please show work.

A: The sample standard deviation is denoted by s. The formula for the sample standard deviation (s) is…

Q: A sample of n = 25 scores is determined to have a standard error of 2 points. what is the standard…

A: Given data, SE=2 n=25 s=?

Q: The results of a nationwide aptitude test in mathematics are normally distributed with mean = 63 and…

A: Normal distribution is a continuous probability density function. Normal distributions are…

Q: A standard deviation derived from a finite sample of means from a population of scores is known as…

A:

Q: Find the mean, standard deviation, skewness, kurtosis of the blood sugar

A: Given data is:

Q: A farmer claims that the mean cotton yield per acre is less than or equal to 850 pounds. The farmer…

A: Hypotheses: Null hypothesis: µ ≥ 850. That is, the mean cotton yield per acre is not less than 850…

Q: A test is made of Ho: μ = 100 vs. Ha : μ ≠ 100. Given a sample size of 100 and its mean of 97 and…

A:

Q: What is the formula for this standard deviation?   What does the central limit theorem say about the…

A: Solution:Standard deviation:The variation between each observation from its mean is known as…

Q: Find the 90 percent confidence interval for the variance and standard deviation for the time it…

A: Solution :  Given : n = 27             s = 8.9 minutes             α = 0.1 Confidence interval for…

Q: the population standard deviation is 15, how large a sample is necessary to have a standard error…

A: Given  Population standard deviations σ=15, standard error=se>8

Q: If the population standard deviation is 10, how large a sample is necessary to have a standard error…

A: The population standard deviation is 10 and the standard error is less than 5 points.

Q: The result of a nationwide aptitude test in mathematics are normally distributed with mean =63 and…

A: We have to find 97.5   th percentile value...

Q: The waiting time to check out of a supermarket has had a population mean of 10.28 minutes. Recently,…

A: State the hypotheses That is, there is no evidence that the population mean waiting time to check…

Q: The average weekly earnings of bus drivers in a city are $950 with a standard deviation of $45.…

A: The formula for calculating the standard error of the sample is,

Q: A restaurant claims the customers receive their food in less than 16 minutes. A random sample of 39…

A: From the given information, the restaurant claims the customers receive their food in less than 16…

Q: At a local restaurant, the amount of time that customers have to wait for their food is normally…

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Q: 7. For a population with a standard deviation of σ = 20, how large a sample is necessary to have a…

A: Standard deviation: Standard deviation is defined as the positive square root of Variance. It is…

Q: Assume the random variable X is normally distributed with a mean of 50 and a standard deviation of…

A:

Q: A leasing firm claims that the mean number of miles driven annually, , in its leased cars is less…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: A random sample of size n= 16 was drawn from a population. If it is known that the population has…

A: Given : Mean = 32 Sample size =n = 16 Standard deviation = 5

Q: When conducting a t-test, you obtain the estimated standard error by dividing the sample standard…

A: Given the standard error is obtained by dividing the sample standard deviation by A. n-1B. nC. n-1D.…

Q: In developing patient appointment schedules, a medical center wants an estimate of the mean time…

A: Obtain the large sample size needed. The large sample size needed is obtained below as follows: Use…

Q: If the standard deviation of scores on the MCAT exam is 11.0, how large a sample is needed to…

A: The random variable score follows normal distribution. We have to find the sample size.

Q: Suppose that IQ scores have a bell shape distribution with a mean of 105 and a standard deviation at…

A: Solution: Let X represent the IQ scores of students.  The distribution of X is bell shape…

Q: The average test scores in a Science class is normally distributed with a standard deviation of 8.…

A: Solution : Given : σ = 8             n  = 200             x¯  = 170 Confidence level = 0.85      ∴…

Q: For a normally distributed data set with mean 20 and standard deviation 4.  According to the…

A: Solution-: Given: μ=20,σ=4 We want to find what percentage of the data lies between 8 and 32?

Q: If the population standard deviation is unknown, then we could use the sample standard deviation to…

A: We have given that the statement about the standard error of the mean. The formula of standard error…

Q: What is the standard deviation of the distribution of means for samples of size 2?

A: Introduction:The standard deviation of the distribution of means in called the standard error of…

Q: Assume the random variable X is normally​ distributed, with mean μ=50 and standard deviation σ=7…

A: Normal distribution is a continuous distribution which has many real life applications. Normal curve…

Q: A researcher conducted a research at a local high school wherein she found out that, among the 150…

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Q: Compute the range and sample standard deviation of flight time.

A: We have to calculate the range and sample SD for the given data.

Q: A sample of size 400 is taken from a population whose standard deviation is 16. Find the standard…

A:

Q: Consider a random sample size of 100 drawn from a population with mean 50 and standard deviation 10.…

A: The mean is 50 and the standard deviation is 10.

Q: Find the standard deviation of the sampling distribution of sample means using the given…

A: Given,μ=55 , σ=10and n=4

Q: The average test scores in a Science class is normally distributed with a standard deviation of 8.…

A: Given that,  n=200 X bar=170 Std. dev.=σ=8

Q: With a mean of 10 and standard deviation of 5. Assume that the population data are normally…

A: The mean is 10 and the standard deviation is 5.

Q: Assume the random variable X is normally​ distributed, with mean μ=47 and standard deviation σ=8.…

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Q: According to an article in Good Housekeeping, a 128-lb woman who walks for 30 minutes four times a…

A: Given, Sample size = 35 Sample mean = 9.1 Sample standard deviation = 5   Set up the null and the…

Q: If a quality control manager wants to estimate the mean life of light bulbs to within + 21 hours…

A: The margin of error is value by which an estimated value of population parameter can differ from the…