A random sample of 15 students was selected and their ACT score recorded. 22 33 29 15 20 30 22 19 27 25 27 26 20 32 24 28

Q: What is the purpose of the confidence intervals in Statistics?

A: Confidence interval is derived from the Sample stastics for the estimatation of population…

Q: What is the positive predictive value ppv)? Use this in a sentence explaining to a person the…

A:

Q: What does it mean to say that a test is nonparametric? What are the relative advantages of such…

A: The objective is to define non-parametric test and its advantages. A parameter is essentially…

Q: The test is used to test hypotheses associated with enumerated, categorized data. This test is used…

A: The objective is to determine the appropriate test, which involves enumerated categorized data.…

Q: What is the difference between a descriptive and inferential statistics? When should you use each…

A: Descriptive and inferential statistics are two types of statistical analyses that are commonly used…

Q: What is an “average” z-score? Explain your answer?

A: A Z-score is a numerical measurement that describes a value's relationship to the mean of a group of…

Q: What does an extreme value at the high end of the data set mean?

A: The numerical data can be divided into two parts. One being discrete and other continuous. As the…

Q: The test statistic is wrong

A: We have given that  s12  = 1315,  n1= 15 s22  = 1523,  n1= 19

Q: What is a T-Test? How is it applied to a Single Population Data Set?

A: Student's t-test was given and first used by W.S. Gosset in 1908. The statistician W.S. Gosset is…

Q: Define the confidence level?

A: It is the likelihood of containing the true population parameter under the confidence interval when…

Q: In statistics, what is a Confidence Interval and how confidence intervals are used in research

A: We have define the confidence interval . Also we have find the its use in the research

Q: World Wide Web has a subsection designed to assess the "honesty" of the test-taker. You are…

A: Population mean=1148Sample mean=144Standard deviation =25 We have to finda...Null and Alternative…

Q: what is an example of test measure for validity?

A: Mathematically, the validity coefficient measures the validity of a test which is related to…

Q: wrong answer for letter c, it was asking the LOWER quartile.

A: Percent of calories consume by Americans follow normal distribution with mean 36  and standard…

Q: One personality test available on the World Wide Web has a subsection designed to assess the…

A: We have given that Mean(µ) = 140 Sample mean (x̅) = 134 Standard deviations (s) = 28

Q: how will you relate the formulas for quartiles and deciles of grouped data?

A: The formula for the ith quartile is: Qi=L+in4-cff.w Where L is lower bound of the class, c.f is…

Q: The p-value is correct, but the z-score is incorrect

A: It is given that a sample of 200 homes sold in which 113 homes with sales prices over median and 87…

Q: What is the lowest measure of central tendency and is used primarily for nominal data to identify…

A: We know there are mainly three measures of central tendency:Mean, mode and medianWe first know where…

Q: How do i find the test statistic and the p-value?

A: The sample sizes are 22 and 22.

Q: One personality test available on the World Wide Web has a subsection designed to assess the…

A: Given data Hypothesized mean = 142 Population Standard deviation = 25 Sample size n = 100…

Q: One personality test available on the World Wide Web has a subsection designed to assess the…

A: Given that  Suppose the true mean score among the general population on the subsection is 14. Fill…

Q: how do i find quartile 1 in a set of data?

A: First quartile: The first quartile is the middle-most observation or median of the lower half of the…

Q: Explain the concept of standardize the predictor variable ?

A: Standardization is the process of putting different variables on the same scale. The standardization…

Q: What is p value ?

A: The​ P-value is the probability of observing difference in the sample statistic this high or higher…

Q: How to draw a boxplot with the same quartile 2 and quartile 3?

A: Boxplot is a graphical representation that indicates the five-number summary of data. The…

Q: What does Level of Confidence indicates?

A:

Q: ▾ Part hn Paul teaches five sections of Introductory Psychology. He wants to know whether or not the…

A: In the given situation, There are 5 sections. Section 1 has 38 values, section 2 has 37 values,…

Q: Do you know how to construct quartiles?

A: Quartiles: It is a method of dividing the data into four parts, 0% to 25% of 25% of data is the…

Q: What are confidence intervals?

A:

Q: What is the significance of a z-score?

A: The value of z score tells that how many standard deviations the data is spread away from mean. The…

Q: What happens to the width of a confidence interval as the significance level, a, decreases?

A: There is two things Significance level: which is the prefixed probability of type I error before any…

Q: Explain how F-statistic has two types of degrees of freedom?

A: Introduction: Degrees of freedom can be defined as the number of values in an analysis, that can be…

Q: Suppose we measure GPA for people in our class, we find the mean is 2.8 and the median is 3.2. What…

A: Given: Mean = 2.8 Median = 3.2

Q: What are the Four Steps to use when working with the t-test ?

A: The Four Steps to use when working with the t-test with p-value approach is given below: Step 1:…

Q: Prof. Watson wants to predict children’s aggressive scores based on the participants’ gender and…

A: Given information: Prof. Watson wants to predict children’s aggressive scores based on the…

Q: What is a confidence interval in statistics?

A: In inferential statistics, the two types of estimation are: point estimate and confidence interval…

Q: Why are confidence intervals important and what do they mean to a study?

A: The confidence interval at 100 (1 – α) % confidence level gives us an interval estimate about the…

Q: IQ tests are approximately normally distributed with a mean of 100 for adults. A tech company CEO…

A: Solution: Here, the hypothesis test is to be conducted if the average IQ of employees at high-tech…

Q: For effective learning, an instructor advised his students to practice solving statistical problems…

A: Given data is6.5,4,3.5,0,12,5,12,15,12,0,1,8,0.5,2,7sample size(n)=15Confidence…

Q: Explain the major difference between an experiment and an observation.

A: In an experiment, the researcher manipulates every aspect for deriving a conclusion. In…

Q: What are some of the most basic statistic formulas used in excel for the Hospitality carrier field?

A: Some of the basic formulas are given as mean, median, mode, quartiles etc