A If the computed value of variance and standard deviation is zero (0), this suggests that the data set are more dispersed has no variation less dispersed more varied

Q: . A sample of 60 women found that they run an average a  of 5km a week with a variance of 64.…

A: Given Data : For Sample 1 x̄1 = 5 s1 = 8 n1 = 60 For Sample 2 x̄2 = 3 s2…

Q: What is the 95% confidence interval for u 14.06-16.494 14.15-16.345 14.423-16.107 14.516-16.084 What…

A: See the handwritten solution

Q: Noise pollution is measured in decibels. In Nevada any motorcycle made after 1980 may not be any…

A: The null and the alternative hypotheses are, Test statistic: Thus, the test statistic is 58.

Q: Why roles are reserved for the variance and particularly for its square root, the standard…

A: Variance and standard deviation: Variance measures absolute variability in a data set, calculated…

Q: Two variables have the regression lines 3x + 2y = 26 and 6x + y = 31. Find the mean values, the…

A:

Q: Table 2 gives the output for 8 cropping seasons of Sweet Spring Country Farm that used each of 4…

A:

Q: One study claims that the variance in the resting heart rates of smokers is different than the…

A: Sample 1(smokers): n1=9s12=581.4 Sample 2(non-smokers): n2=9s22=103.8 Level of significance, α=0.05…

Q: The image database was collected through a questionnaire from a software engineering course.…

A: From the given information, It is required to compute the variance , standard deviation and…

Q: A track coach creates a new training program to improve his team’s performance in the 200m race. He…

A: State the hypotheses.

Q: Is it possible to obtain a negative value for the variance or standard deviation?

A: The variance and the standard deviation, which is the square root of the variance are the most…

Q: A sample of final exam scores is normally distributed with a mean equal to 20 and a variance equal…

A:

Q: The sum of squares of deviation is least if measure from а. Median b. Mean

A: the sum of squares of deviation is least when measured from ?

Q: Suppose the rate of misprints in the printed text from a given publisher is three misprints per one…

A: The question is about discrete probability distribution.Introduction :1 ) Let, X be discrete random…

Q: If a set of data is normally distributed with a mean of 20 and a variance of 16, a z-score of -3.8…

A: Let raw score is X.  Then Z Score is given by, Z= (X- mu)/sigma Where mu is mean  And sigma  is…

Q: A medical researcher wishes to see whether the variance of the heart rates (in beats per minute) of…

A: The null and alternative hypotheses are given below. H0: σ12 = σ22 H1: σ12 ≠ σ22 The test statistic…

Q: a sample of 60 grade 9 student age was obtained to estimate the mean age of all grade 9 students. x…

A: A sample of 60 Grade 9 students' ages was obtained to estimate the mean age of all Grade 9 students.…

Q: One study claims that the variance in the resting heart rates of smokers is different than the…

A: Given that  Sample sizes n1 =4 , n2=4 Sample variances s12=126.8 , s22=597.6

Q: st 15 years have shown that the average rainfall in a certain region of the country, for the month…

A: Given:n1=15n2=15x bar1=1.20x bar 2=1.35s1=0.45s2=0.54 The assumptions is of the normal populations…

Q: The following is the summary of a sample data collected on n=10 students on x= # of hours spent…

A: We have to calculate MSE for regression of y on x

Q: The cholesterol levels of adult males are approximately normally distributed with a mean of 224…

A: State the hypotheses That is, there is no evidence that the variance of the cholesterol levels of…

Q: Why n-1 is used in the denominator for the variance for a normally distributed continuous RV

A:

Q: 5. Given (kx? if z = 1, 2, 3, 4 P(x) = else sa probability function for a discrete random variable;…

A:

Q: Two students sit for a university final exam whose scores are known to be normally distributed. The…

A: If raw scores are given by X= 63, Y= 93 Then z score for x is given by, Z= (X- mu)/sigma Where mu is…

Q: The difference between the largest and the smallest data values is the А. variance В. interquartile…

A:

Q: 3. A sample of 25 hens from a normal population showed that the average egg laying is 250 eggs per…

A: Given Data: Sample mean (x¯)=250Sample Variance (s2)=625n=25 H0: μ=285 HA: μ≠285   Under H0:…

Q: The mean age of children at the X College daycare center is 6. The ages are skewed in a negative…

A: μ=6 σ2= 5.1

Q: Fertilizer 1 Fertilizer 2 Fertilizer 3 Fertilizer 4 51 47 57 50 47 50 48 61 56 58 52 57 52 61 60 65…

A: Given data :

Q: Is there enough evidence to question Harley’s claim of 10 decibels?

A: Given: Sample size (n) = 30 Sample variance (s2) = 20 Hypothesized variance (σ2) = 10

Q: Records from previous years for a casualty insurance company show that its clients average a…

A: Answer:

Q: If the mean of grades in statistics = 65 and the variance : 400 , then the Z score of grade 50 =

A:

Q: Recent evidence suggests that graduating from college during bad economic times can impact the…

A: a. The null and the alternative hypothesis are, H0: μ1−μ2 ≤ 0; HA: μ1−μ2 > 0

Q: A group of students (large group) took a test in mathematics and the final scores have a mean of 68…

A: Given Data: Let X represent the final scores  Mean(X)=68 Var(X)=100 SD(X)=10 X~ Normal (68, 100)

Q: The average number of students in the college of business is 56, with a variance of 5. The…

A: GivenMean(x)=56Varaince(σ2)=5standard deviation(σ)=5=2.2361Median  was greater than mean by

Q: You are conducting a study to see if students do better when they study all at once or in intervals.…

A: 1. Computing the values of the test statistics: The null and alternative hypotheses are: It is…