From a population that is not normally distributed and whose standard deviation is not known, a sample of 47 items is selected to develop an interval estimate for μ. Which of the following statements is true? O a. The t distribution with 47 degrees of freedom must be used. b. The sample size must be increased in order to develop an interval estimate c. The t distribution with 46 degrees of freedom must be used d. The standard normal distribution can be used

Q: Use the given information to find the minimum sample size required to estimate an unknown population…

A: Solution

Q: What are the mean and standard deviation of the normal distribution curve pictured below? It was…

A: From this graph we have to find mean and standard deviation.

Q: X follows a normal distribution with mean 45 and standard deviation 6. The z-variate corresponding…

A: Answer : The value of the X-variate is : (c) 54.

Q: use the given information to find the minimum sample size required to estimate an unknown population…

A: Standard Deviation = σ = 89 Margin of Error = E = 5 Confidence Level = 95 Significance Level =…

Q: For a normal distribution with a mean of m=60 and standard deviation of s=10, find the proportion of…

A: Since we only answer up to 3 sub-parts, we’ll answer the first 3. Please resubmit the question and…

Q: 3. Using the z-table and t table, solve the following problems. a. Given a normal distribution with…

A: Population mean μ=35, standard deviations σ=8

Q: Describe the shape, the mean, and the standard deviation for each of the following two…

A: 3. a) Given that the population of scores with μ=50 and σ=6. In this case, Shape: Bell shape(Normal)…

Q: 3. Which of the following statements is true about the no A. The normal distribution curve has a…

A: We know that a normal distribution is a continuous random variable. 1. For any probability…

Q: Assume the blood sugar of all Barbadians have mean µ= 200 and standard deviation σ = 24. The blood…

A:

Q: about the normal distribution:    Select what applies.   1. the mean corresponds to the z score…

A: we have to find correct statement for each question

Q: For a normal distribution with a mean of μ = 70 and a standard deviation of σ = 10, find the…

A: (a) Obtain the proportion of the population scores greater than 80. The proportion of the population…

Q: for a population with a standard deviation of o=20 find the z-score for each of the following…

A:

Q: Suppose X has a normal distribution with mean 125 and standard deviation 15.  Which of the following…

A: Mean=M=125, Standard deviation=S=15

Q: It is assumed that the results of a test follow a normal distribution with a mean of 78 and a…

A: It is given that the mean is 78 and the standard deviation is 6.

Q: normal distribution has population mean of 10 and population standard deviation of 2.       Find…

A: Given that  Mean = M = 10 , Standard deviation = SD = 2 Note : According to bartleby experts…

Q: A normal distribution has a population mean of 80 and a population standard deviation of 20. For…

A: Given, Population mean = μ = 80 Population standard deviation = σ = 20 X ~ N (μ = 80,  σ = 20)

Q: The mean weight of apples is 27 kg and the standard deviation is 1.8 kg. Assuming that the weight is…

A: the PDF of normal distribution is = 1/σ * √2π * e ^ -(x-u)^2/ 2σ^2standard normal distribution is a…

Q: Assume that a randomly selected subject is given a bone density test. Bone density test scores are…

A: Obtain the 7th percentile of the distribution.   The 7thpercentile of the distribution is obtained…

Q: For a normal distribution a mean of 60 and a standard deviation of 10, find the proportion of the…

A: It is given that the mean is 60 and the standard deviation is 10.

Q: The weight, in kilograms, of cereal in a box can be modelled by a normal distribution with Mean u…

A:

Q: The distribution of IQ scores of the population is normally distributed with a mean of 100 and a…

A: Given distribution is normally distributed Let, X : IQ scores of population Mean=μ=100 Standard…

Q: Decide which of the following statements are True.  A.For any normal distribution, the mean,…

A: Normal distribution are symmetric about mean.

Q: A camp director is interested in the mean number of letters each child sends during his or her camp…

A: Critical value: Using Excel formula “=NORM.S.INV(1-(0.07/2))”, the critical value for 93% confidence…

Q: A given distribution has a population mean, µ, of 110 and a population standard deviation, o, of 15.…

A: The population mean is = 110 And the SD = 15 The value of X is 140

Q: A variable of a population has a mean of u = 83 and a standard deviation of o = 24. a. Identify the…

A: We have to fill given blanks.

Q: For a sample of 300 mass values, the mean is 120 g and the standard deviation is 10 g. Assuming a…

A: From the provided information, Sample size (n) = 300 Sample mean (x̄) = 114 Standard deviation (s) =…

Q: Given that x is a normally distributed variable with mean equal to 40 and standard deviation equal…

A: P(x ≤ 45) = 0.8413

Q: A normal distribution has a population mean of 80 and a population standard deviation of 20. For…

A: Here, population mean=μ=80 and population standard deviation=σ=20 are given. For each value x, the z…

Q: For a normal distribution with a population of  μ = 54 and a standard deviation of σ = 12, find the…

A:

Q: Show that Quartile deviation of normal distribution is approximately 3

A:

Q: 3. Determine the following from the graph. Show all your work. a. Determine the mean and standard…

A: Given the graph :

Q: Given x has normal distribution with a mean of a and standard deviation equal to 2. Which value of x…

A: The question is about normal distribution Given : Mean ( μ ) = a Std. deviation ( σ ) = 2 z score =…