Suppose that you go to a NJ lake to grab water samples to test algal concentrations using a cell counter. That instrument is certified to have a minimum detectable relative difference of 10%. The water sample testing result shows that the mean algal number is 1500 #/ml with a standard deviation of 250 #/ml. Roughly how many samples are required at least to be collected at a confidence level of 95% and power of 90%? O 5 O 10 O 15 O 21

Q: In order to infer on the mean height of children in a school , a sample of 36 students were…

A: Obtain the standard error for the sample mean. The standard error for the sample mean is obtained…

Q: It is necessary for an automobile producer to estimate the number of miles per gallon achieved by…

A: The provided information are:

Q: 4. The desired percentage of Silicon Dioxide (SiO2) in a certain type of aluminous cement is 5.5. To…

A: given , n = 16  As population stdev is known , use Z test

Q: The pulse rates of 170 randomly selected adult males vary from a low of 44 bpm to a high of 124 bpm.…

A: Given, the pulse rates vary from a 44 bpm to a high of 124 bpm and the margin of error (E) is 4.

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A: For Scenario 1:Since the standard deviation of the population is known (7.5), we will choose to…

Q: The blood platelet counts of a group of women have a​ bell-shaped distribution with a mean of 261.6…

A:

Q: Consider the following hypothesis Ho : H= 100 H: u # 100 A sample of 16 observations yields a sample…

A: From the provided information, Sample size (n) = 16 Sample mean (x̅) = 95 Population standard…

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A: Given data, 5.9, 5.0, 6.5, 5.6, 5.9, 6.5 The sample mean and sample standard deviation is Mean is…

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A: Given information Sample size (n) = 10 Sample mean x̅ = 33.8 Standard deviation (s) = 13.8…

Q: A sample of 20 heads of lettuce was selected. Assume that the population distribution of head weight…

A: n=20

Q: The blood platelet counts of a group of women have a bell-shaped distribution with a mean of 255.7…

A: Here mean is 255.7 and standard deviation is 60.8. We will use z-standard normal distribution.

Q: Assume that a sample is used to estimate a population mean μμ. Find the margin of error that…

A: Solution: Given information: n= 13 Sample size  x= 54.9  Sample mean s= 16.6 Sample standard…

Q: The puise rates of 174 randomly selected adult males vary from a low of 41 bpm to a high of 117 bpm.…

A: Given that  The pulse rates of 174 randomly selected adult males vary from low of 41 bpm to high of…

Q: 1. Draw a normal bell curve. Label all parts using the Empirical Rule.

A: Emperical rule is a statistical rule that states that for a normal distribution- About 68% of the…

Q: 10. The established mean for the number of copies a customer makes per visit at a copy store is 37.…

A: Null Hypothesis: A hypothesis which is tested for plausible rejection is called the Null Hypothesis…

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A: It is given that, H0: μ=232 H1: μ≠232  Sample size, n=66 Sample mean, x̅=231.6 standard deviation=…

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A:

Q: The following data represent the concentration of organic carbon (mg/L collected from organic soil.…

A: A sample of 20 organic carbon (mg/L) collected from organic soil with mean is 17.63 mg/L, and…

Q: Mrs. Paul wants to test that claim that, on average, her students average mark is 85. She pulls the…

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Q: Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone…

A: Let 'x' be the amount of ozone in the upper atmosphere. The sample mean and standard deviation for a…

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A: A random sample of 18 students with average score 6 and standard deviation is 1.815; n=18…

Q: The pulse rates of 177 randomly selected adult males vary from a low of 38 bpm to a high of 114…

A: Assume, X be the random variable representing the pulse rates (in bpm). n be the minimum sample…

Q: A sample of 25 observations provides the following statistics sx=16,sy=19 and sxy=118.69. Calculate…

A: Formula for test statistic:

Q: Assume that a sample is used to estimate a population mean μμ. Find the margin of error M.E. that…

A:

Q: random sample of 76 eighth grade​ students' scores on a national mathematics assessment test has a…

A:

Q: Assuming that the sampled homes for sale are uniformly distributed throughout Winston-Salem and that…

A: From the given data set, The random sample of homes is, n = 30 The number of single floor homes in…

Q: Assume that the readings at freezing on a batch of thermometers are normally distributed with a mean…

A:

Q: The time needed for college students to complete a certain paper-and-pencil maze follows a Normal…

A: Significance level = α=0.01\alpha = 0.01 sample size of n=9n = 9 critical value =  zc=2.576z_c =…

Q: We want to estimate the mean number of pages per book in the fiction section of the large school…

A: Given: Sample size, n = 35 Mean = 291.8, SD = 47.6

Q: Assume that a sample is used to estimate a population mean μμ. Find the margin of error M.E. that…

A: The summary of the statistics is,   Critical value: By using the z-tables, the critical value at…

Q: The General Survey data shows that the mean age at first childbearing for women (N = 625) is 24.12…

A: Given Population 1 ( women )  and population 2 ( men ) test whether there is difference between…

Q: The blood platelet counts of a group of women have a bell-shaped distribution with a mean of 245.4…

A:

Q: Two sets of chromium analyses were performed on water samples from a stream that runs near a…

A: Given: Two sets of chromium analyses were performed on water samples from a stream that runs near a…

Q: Which of the following statements concerning internal reliability is correct? A. When reliability…

A:

Q: Consider a large population with?=67 and ?=6. Assuming ?/?≤0.05, find the mean and standard…

A: GivenMean(μ)=67standard deviation(σ)=6