The critical F-value at the 1% level of significance is

Q: A sample of n = 4 scores has a mean of x̅ = 40, with a sum of squares of SS = 48. What is the…

A: Given that n=4, x̅ = 40 and SS=48 Consider, the variance, s2=SSn-1=484-1=16

Q: Express the k th percentile, Pk , of a normally distributed variable in terms of its mean, μ, and…

A: The kth percentile represents the area of k to the left of z. Here, the kth percentile is calculated…

Q: Which proportion of a normal distribution is located between z = 0 and z = +1.50?

A: Solution: Here, it is needed to find the proportion of a normal distribution is located between z=0…

Q: normal distribution of scores has a mean of 10.3 and a variance of 5.16. What is the exact…

A:

Q: You are conducting a study to see if the proportion of women over 40 who regularly have mammograms…

A: Let p be a variable denoting the population proportion of women over 40 who regularly have…

Q: Why are there no negative values for the F-ratio? Why do values in the F-distribution cluster around…

A: Given information: The property of F-distribution is given.

Q: The critical z-scores that correspond with the .01 level of significance are: 1) +/- 2.58 2) +/-…

A: Note: Hi there! Thank you for posting the question. As there are +/- signs in the options, hence, it…

Q: What z-score is equal to z0.05? Draw a normal curve as part of your work.

A: Givenz0.05=

Q: Calculate the Residual associated with the prediction of your height. Is the predicted height an…

A: The regression equation that is calculated to predict the height using the shoes sizes is as follows…

Q: You are conducting a study to see if the proportion of men over 50 who regularly have their prostate…

A: given data  right tailed test claim : p>0.2 Z = 1.699 p value = ?

Q: For the standard normal curve, find the z-score that corresponds to the 7th decile

A: standard normal distribution Z~N(0,1) find z score correspond to 7th decile

Q: Find the X value corresponding to z = +0.75 for a distribution with population mean of 90 and…

A: Solution: From given information, µ=90, σ=12 and z=0.75.

Q: You are conducting a study to see if the accuracy rate for fingerprint identification is…

A: It is given that the test statistic is 1.182.

Q: find the 80th percentile of a normal distribution where x=n(50,10)

A: Step 1:Find the 80th percentile of a normal distribution.X∼N(50,10)=X∼N(μ,σ)Step 2:Find the Z-score…

Q: A doctor wants to estimate the mean HDL cholesterol of all​ 20- to​ 29-year-old females. How many…

A: Find z-critical value:…

Q: A production line produces glass panels with side length having a uniform distribution with mean 5…

A: Given that a production line produces glass panels with side length having a uniform distribution…

Q: Find the critical z a/2 that corresponds to a degree of confidence of 91%

A:

Q: if alpha is 1%, find the critical value (z-score)

A:

Q: Assume that IQ scores are normally distributed with μ = 100 and σ = 15 What percent of IQ scores…

A: The normal distribution is the most useful theoretical distribution for continuous variables.  For…

Q: You want to estimate the mean hourly yield for a process that manufactures a face wash. You observe…

A: Given that ; x‾=42 n = 100 S = 4 By using the margin of error formula to solve this problem.

Q: You are conducting a study to see if the proportion of women over 40 who regularly have mammograms…

A: Answer:- Given, The test statistic is, z = 2.61, The test is right-tailed test.  We use standard…

Q: Using the t table, determine the proper boundaries for a 95% interval (symmetric about the center)…

A: given data  df = 17 95% interval symmetric about the center

Q: For the standard normal curve, find the z-score that corresponds to the third quartile then find the…

A: To find the Z-score for the first quartile and third quartile for a standard normal curve.

Q: EITHER state the critical values and use the critical values/z-obtained comparison OR use the…

A: Independent sample t -test is used to find the mean difference between two independent group means.…

Q: A normal distribution has a mean of µ = 24 with σ = 3. What is the minimum score needed to be in the…

A: given data  normal distribution μ = 24σ = 3 to be in top 14% minimum required score = ?

Q: You are conducting a study to see if the proportion of women over 40 who regularly have mammograms…

A: Given z= -2.806  where z is standard normal variable. Formulae used: P value= P(Z<z)

Q: ean when the results are marginally significant? What is the relationship between marginal…

A: Marginally significant results means when the p-value is a little greater than 0.05.

Q: What happens to the percentile ranks as one moves from left to right on the X-axis

A: To check how the percentile ranks changes as one moves from left to right on the x-axis.

Q: The average exam score is 63 with a variance of 33.  Your exam has a Z score of 0.96. What is your…

A:

Q: Please also explain why you determined whether or not the results are statistically significant.  A…

A: From the given information we find the solution.

Q: For the standard normal curve, identify the z-score that corresponds to the 20thpercentile.

A: The z-value corresponding to 80% or an area of 0.80 is 0.8416 as per z-table.

Q: Find the Z-score that describes the following proportions under the normal curve (within 0.01…

A: We have tl find z score that describes given event .  We have to use z table for it.

Q: In a normal distribution of test scores, a score of X = 70 has a percentile rank of 54%. This means…

A: The pth percentile of a set of observations is the value below which, p% or (p/100) proportion of…

Q: For testing the statistical significance of difference in mean cholesterol values between obese…

A: Independent two samples t test: The independent samples t-test can be used to examine a possible…

Q: A traffic safety company publishes reports about motorcycle fatalities and helmet use. In the first…

A: Total frequencies  = 1029 + 854 + 38 + 90 + 50 = 2061 Expected  frequency  = total frequency  x…

Q: Plants were grown using 5 different fertilizers and the number of flowers that each plant produced…

A: Hypotheses: Null hypothesis: H0: There is no effect of fertilizer on the number of flowers.…

Q: What proportion of scores are above z-score of 1.0 in a normal distribution?

A: We want to find P(Z>1)= ?