# Get help with descriptive statistics problems

Recent questions in Descriptive Statistics
Lilliana Livingston 2022-07-20

### Transforming an entire distribution of scores into z-scores changes an originally positively skewed distribution to a negatively skewed z-score distribution. True or False

Awainaideannagi 2022-07-20

### When is meta-analysis is most useful?

stratsticks57jl 2022-07-19

### complete k-partite graphsI am trying to solve the following problem:Let G be a nonempty graph with the property that whenever $uv\notin E\left(G\right)$ and $vw\notin E\left(G\right)$, then $uw\notin E\left(G\right)$. Prove that G has this property if and only if G is a complete k-partite graph for some $k\ge 2$. (Consider $\overline{G}$).The converse is straightforward and is given by the definition of the complete k-partite graphs, however, the direct way is not trivial and I could not get it.

Javion Henry 2022-07-19

### A survey found that​ women's heights are normally distributed with mean 63.4in and standard deviation 2.4in. A branch of the military requires​ women's heights to be between 58 in and 80 in. a. Find the percentage of women meeting the height requirement. Are many women being denied the opportunity to join this branch of the military because they are too short or too​ tall? b. If this branch of the military changes the height requirements so that all women are eligible except the shortest​ 1% and the tallest​ 2%, what are the new height​ requirements?a) The percentage of women who meet the height requirement is:The website says I am supposed to use $\frac{z-\lambda }{2.4}$doing so gives me $\frac{16.6}{2.4}=7.086$ This value literally is useless. What am I doing wrong?

Luciano Webster 2022-07-19

### Underline the correct word (in the parenthesis) to complete the sentence. 4) When normal scores are transformed into z-scores, the resulting z-scores will have a mean of (0, 1 ). 5) For a normal random variable, the probability of observing a value less than or equal to its mean is (0,0.5, 1).

Libby Owens 2022-07-19

### What is the z-score of X, if n = 25, $\mu =60$, SD = 12, and X =58?

Parker Bird 2022-07-19

### assuming that the system downtime is normally distributed with mean ($\mu$)4.47 sec and standard deviation($\sigma$) of 0.38 sec.By using the cumulative (to the left) Z score table,a) find the probability that the system downtime is more than 5 sec.z score = (n-$\mu$)/ $\sigma$ = (5-4.47)/0.38 = 1.39the probability for 1.39 in the z score table is 0.9177so, P(x$\le$5)= 0.9177P(x>5)= 1- 0.9177 = 0.0823b) what is the minimum downtime duration for the worse 5% ?(i already got the answer for a, i just don't quite understand the meaning of 'for the worse 5%' )

kislotd 2022-07-18

### What type(s) of distributions can a z-test be applied to?

Paxton Hoffman 2022-07-18

### You are interested in finding how many hours a person is willing to wait for a plane. It is found that the time people are willing to wait has a $\mu =5.2$ and a $\sigma =1.1$. What is the probability a person is willing to wait more than seven hours?Using the standard score formula, $z=\left(x-\mu \right)/\sigma$, the z-score equals to two decimal places 1.64, which corresponds to a probability of 0.9495 on my z-score tables. However, on the answer key provided, it states the probability is 0.0505 or what would correspond to a z-score of −1.64.Is this a trick of the wording involved in the question or are my z-tables (or standard score formula) wrong?

Ruby Briggs 2022-07-18

### Which of the following statements about the effect size is CORRECT?a. the effect size is bigger when the two populations overlap more.b. The effect size is NOT affected by the differences between means.c. Standard effect size is always positive, because it is figured using the square root.d. The effect size is bigger when the standard deviation of population gets smaller.

anudoneddbv 2022-07-17

### What is the z-score of X, if n = 20, $\mu =20$, SD =3, and X =31?

owsicag7 2022-07-17

### A successful basketball player has a height of 6 feet 2 inches, or 188 cm. Based on statistics from a data set, his height converts to the z score of 1.95. How many standard deviations is his height above the mean?The player's height is [_] standard deviation(s) above the mean. (Round to two decimal places as needed.)

Mauricio Mathis 2022-07-17

### What is the z-score of sample X, if ?

Avery Stewart 2022-07-17

### What is the z-score of sample X, if ?

Matias Aguirre 2022-07-16

### What is the z-score of sample X, if ?

Damien Horton 2022-07-16