. A machine dispenses a liquid drug into bottles in such a way that the standard deviation of the contents is 45 milliliters. A new machine is tested on a sample of 25 containers and the standard deviation for this sample group is found to be 27 milliliters. At the 2% level of significance, test the claim that the amounts dispensed by the new machine have a smaller standard deviation. (Use χ² - distribution for analysis).

Q: Suppose a variable is Normally distributed with μ=345 and \sigma σ=30. What proportion of the data…

A: Mean(µ) = 345Standard deviations (σ) = 30X ~ N (µ, σ )= N(345, 30)

Q: An article presents the results of a study in which the weights of 295 eggs from 27 week-old…

A:

Q: Your company uses a very expensive machine to manufacture nuclear fuel rods.  The production process…

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Q: Glpha Value = 0s A standard deviation of fuel consumption of a certain automobile is hypothesized to…

A: From the provided information, Sample size (n) = 20 Level of significance (α) = 0.05 Sample standard…

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A: According to guidline we are supposed to solve 1st three part only

Q: A population has a mean μ = 86 and a standard deviation o=27. Find the mean and standard deviation…

A: GivenMean(μ)=86standard deviation(σ)=27sample size(n)=24

Q: A random sample of 10 night students was taken with a sample mean GPA of 3.5 and a standard…

A: given data, x¯1=3.50s1=0.07n1=10x¯2=3.48s2=0.04n1=15population with unequal variances.

Q: Suppose that a researcher is interested in estimating the mean systolic blood pressure, μ, of…

A: Formula : Sample size:

Q: Suppose that a researcher is interested in estimating the mean systolic blood pressure, μ, of…

A:

Q: Suppose that a researcher is interested in estimating the mean systolic blood pressure, 4, of…

A: From the provided information, Confidence level = 95% Margin of error (E) = 5 Population standard…

Q: Let x be a random variable that represents the pH of arterial plasma (i.e., acidity of the blood).…

A: Given Information: Sample size (n) = 31 Sample mean (x¯) = 8.8 Sample standard deviation (s) = 3.3…

Q: Using the accompanying table of data, blood platelet counts of women have a bell-shaped distribution…

A: Sample mean, x¯=255.3 Sample standard deviation, s=65.5

Q: The blood platelet counts of a group of women have a bell-shaped distribution with a mean of 247.7…

A:

Q: The weights of discarded plastic from a sample of 62 households have a mean weight of 1.911 lbs. The…

A: From the provided information, Sample size (n) = 62 Sample mean (x̅) = 1.911 lbs Standard deviation…

Q: A random sample of 25 night students was taken with a sample mean GPA of 2.86 and a standard…

A: We have given with usual notation as follows: For night students: n1=25 x¯1=2.86 s1=0.06 For day…

Q: Suppose a variable is Normally distributed with μ=345 and \sigma σ=30. What proportion of the data…

A: Let X be the random variable from normal distribution with mean (μ) = 345 and standard deviation (σ)…

Q: A researcher is conducting a study where participants exercise on a treadmill for 40 minutes and…

A: From the provided information,Z-score = 2

Q: The blood platelet counts of a group of women have a bell-shaped distribution with a mean of 264.3…

A: given data bell shaped (normal) distribution μ = 264.3σ = 61.1

Q: Suppose the heights of men are normally distributed with mean, μμ = 69.5 inches, and standard…

A:

Q: Let x be a random variable that represents the pH of arterial plasma (i.e., acidity of the blood).…

A:

Q: In a sample of 14 randomly selected high school seniors, the mean score on a standardized test was…

A:

Q: Let x be a random variable that represents the pH of arterial plasma (i.e., acidity of the blood).…

A: Consider that μ defines the population mean pH of arterial plasma.   Here, it is needed to check…

Q: is there enough evidence to support the​ administrator's claim

A: Given that  Sample size(n)= 76 Sample mean (x¯) = 283 Population standard deviation(σ) = 31 Level of…

Q: Let x be a random variable that represents the pH of arterial plasma (i.e., acidity of the blood).…

A: a. Let μ is defined as the population mean pH level of the blood. The claim of the test is that the…

Q: The blood platelet counts of a group of women have a bell-shaped distribution with a mean of 251.8…

A: Given: The Given Mean Value is 251.8 and standard deviation 62.1 To Find the Approximate Percentage…

Q: Suppose the heights of men are normally distributed with mean, μμ = 69.5 inches, and standard…

A: Solution

Q: A fast food restaurant estimates that the mean sodium content in one of its breakfast sandwiches is…

A: Solution: Given information: n= 42 Sample size  x=915 Sample mean μ=923 Population mean σ=24…

Q: the standard deviation is 6.9. We wish to test Ho:μ = 101.2 versus H₁:μ 101.2 with a sample of n = 7…

A:

Q: The blood platelet counts of a group of women have a bell-shaped distribution with a mean of 259.1…

A: The approximate probability is to be derived with the interpretation of the empirical formula, which…

Q: Suppose that a researcher is interested in estimating the mean systolic blood pressure, µ, of…

A: Sample size determination is a crucial and the foremost stage before any statistical analysis, which…

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

A: (b) The type of test statistic to use is z-test

Q: A study of working actors looked at age and gender. One sample of 45 male actors had a mean age of…

A:

Q: An obstetrician read that a newborn baby loses on average 7 ounces in the first two days of his or…

A: From the provided information, Sample size (n) = 35 Sample mean (x̄) = 6.8 Population standard…

Q: We collected a sample of twenty-five observations. We assumed that the observations are from a…

A: Given that,The sample size  is 25.The standard deviation  is 5. The level of significance is 5%.The…

Q: Assume that the data come from normal populations with unequal variances. Round your answers to…

A: It is given that the data of two samples. •). For night students: Sample mean = 2.86 Sample standard…

Q: In a sample of 14 randomly selected high school seniors, the mean score on a standardized test was…

A: To test the hypothesis we will use t distribution

Q: In a random sample of 7 cell phones, the mean full retail price was $548.40 and the standard…

A:

Q: Suppose that a researcher is interested in estimating the mean systolic blood pressure, μ, of…

A: The population mean systolic blood pressure is .It is needed to find the sample size with 99%…