In order to have the standard error of the mean be 6, one from a would need to take a sample of size normally distributed population with a standard deviation of 42

Q: What is the maximum blood pressure reading of the lowest 70% of adult males?

A:

Q: If the standard deviation for a population increases, the standard error for sample means from the…

A: The standard error is a statistical concept that tests the precision with which a sample…

Q: The nails produced by a machine are assumed to have a mean of 5.0 cm. A random sample of 80 nails…

A: Null hypothesis: H0: µ=5. Alternative hypothesis: H1:µ>5. This is a right tailed test. Here, the…

Q: if you got a 79 on a test in a class with a mean score of 85 ans standard deviation of 5, the z…

A: If mean score of 85 ans standard deviation of 5, then Z-score corresponding to given raw score is…

Q: A normally distributed variable has a mean of 75 and a standard deviation of 2. What is the z-score…

A: The z-score for 69 is obtained below: From the given information, the value of mean is 75 and…

Q: When we compute a standard deviation, we are trying to get a measure of the average distance of…

A: Let us understand better by assuming X1, X2, ...., Xn be n data points. Then,…

Q: The mean and standard deviation of a set of 100 observations were Worked out as 40 and 5…

A: We have given that Number of observations(n)=100  Corrected mean=40 Standard deviation=5  Mistaken…

Q: The IQs of 600 applicants of a certain college are approximately normally distributed with a mean of…

A: Given : The IQs of 600 applicants of a certain college are approximately normally distributed with a…

Q: Suppose the scores of students on an exam are normally distributed with a mean of 264 and a standard…

A:

Q: What is the Z score of an individual with a height of 183cm if the mean of the population is 170cm…

A: Given that mean = 170 SD = 6.1 And the height of individual X = 183

Q: If the population standard deviation is 17, at 95% CI, sample mean is within 5 of the population…

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Q: Since the area under the normal curve within two standard deviations of the mean is 0.95, the area…

A: We have given that,  P(-2<Z<2) = 0.95 Then,  P(Z>2) = ?

Q: The president of a university wants to use the mean of a ma to estimate the average amount of time…

A: Given information Standard deviation σ = 1.40 Confidence interval = 0.99 Significance level(α) = 1-…

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: for a population with a standard deviation of 0.03 and mean of 3.08, draw a bell shaped curve,…

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Q: If the standard deviation, o is known the 2-distribution values may not be used to determine…

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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: If the population standard deviation is 8, at 95% CI, sample mean is within 4 of the population mean…

A:

Q: it is known that the population standard deviation of weight among females is 30. assuming that we…

A: The standard error of the average weight among women of a sample of this size is obtained below:…

Q: A manufacturer claims that the mean weight of its ice cream cartons is 10 ounces with a standard…

A: The random variable is weight of ice cream cartons. The population mean is 10 ounces. The population…

Q: Assume the average income of workers in jordan equal 400 JD, a sample of 500 workers are taken and…

A: Given: Average income of workers in jordan = 400 Sample size n=500 sampling error is 10. standard…

Q: Suppose that the newborn weights are normally distributed with a mean of m kg and a standard…

A: We have given that  Mean(µ) = mStandard deviations (σ) = 0.8

Q: If a z-score is equal to −2.05, it is 2.05 standard deviations below the mean. True or False

A: The standardized difference, which measures the difference between a random score (i.e., a value…

Q: Suppose the mean blood glucose of a population of adults is 162 with a standard deviation of 58.…

A:

Q: A population has a mean of 75 and a standard deviation of 15. If you randomly sample 9 people from…

A: Mean = 75 Standard deviation = 15 Sample size = 9

Q: Assume the annual day care cost per child is normally distributed with a mean of $6000 and a…

A: Let, X=annual daycare cost per child Given that X is normally distributed with mean= 6000 and…

Q: We have collected a sample of size 52. Assuming that we do not have the population standard…

A: Given,sample size(n)=52standard error(SE)=0.969

Q: A population is normally distributed and has a mean of 50 and a standard deviation of 5 If we…

A: As we know the empirical rule of 68 - 95 - 99.7 that is the percent value that are one, two or three…

Q: The population standard deviation for the heights of dogs, in inches, in a city is 5.7 inches. If we…

A:

Q: The score on a test have a mean of 100 and standard deviation of 15. If a personnel manager wishes…

A: From the given information we find the cut off score.

Q: ) Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard…

A: Let "X" be the IQ score of adults. Find z-value (z): Refer Standard normal table/Z-table, Lookup…

Q: If the true mean is .9560 with a standard deviation of .0020 what is the sampling distribution of X

A: if the true mean is 0.9560 with a standard deviation of 0.0020 i.e.  μ=0.9560  and σ = 0.0020

Q: A normal distribution has a mean of 40 and a standard deviation of 5. 68% of the distribution can be…

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Q: A group of patients has a mean height of 160 cm and a standard deviation of 10 cm. What standard…

A: Determine the standard score that would cut off the lowest 50% of scores. The standard score that…

Q: Suppose that the blood pressure of the human inhabitants of a certain Pacific island is distributed…

A:

Q: A professor has found that the grades on the Statistics Final are normally distributed…

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: A manufacturer of calculator batrries claims that the mean length of life for its battry is 500…

A:

Q: The weights of 40 watermelons coming out of a farm are normally distributed with a mean of 6 Kg and…

A: From the given information, Sample size (n) = 40 Ex=6,σx⏞ =1.945 Thus,

Q: Suppose that the daily viewing time is normally distributed with a mean of is 8.35 hours and a…

A: Determine the number of hours of television viewing must a household have in order to be in the top…

Q: Assume the annual day care cost per child is normally distributed with a mean of $7000 and a…

A: Given information: Given that the annual day care cost per child is normally distributed with mean m…

Q: A certain data set has a mean of 60 and a standard deviation of 12. Given that the data set has 120…

A:

Q: it is known that the population standard deviation of weight among females is 30. assuming that we…

A: There is a direct relationship between the margin of error of the interval and the confidence level,…

Q: A manufacturer of bolts has a​ quality-control policy that requires it to destroy any bolts that are…

A: Given information- Mean, x-bar = 9 cm Standard deviation, σ = 0.05 cm We have given that a…

Q: It is known that the mean is 65 and the standard deviation is 10. There are 30 students in the…

A:

Q: According to the best available data, the standard deviation of the times spent by students doing…

A: Obtain the minimum sample size required for the estimate. The minimum sample size required for the…

Q: Suppose you could take all samples of size 77 from a population with a mean of 12 and a standard…

A: Given data, Mean μ=12 sd      σ=3.2 n=77 standard deviation of the sample means σx=?

Q: Based from the record, the mean weight of the newborn babies is 4.8 lbs with a standard deviation of…

A: Given that  Population Mean=4.8  Standard deviation=0.75 Sample size=60

Q: Suppose a population has a mean weight of 180 pounds and a standard deviation of 25 pounds. A sample…

A: Formula : The standard error of the mean  : σ_x̄ = σ/√n

Q: Suppose that the standard deviation for monthly rent is$400. How many apartments should be sampled…

A:

Q: The time needed to find a parking space is normally distributed with a mean of 20 minutes and a…

A: 90% of the time, it takes less than  26.63 minutes to find a parking space. Explanation is given…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.