Before you took this course, you probably heard many stories about Statistics courses. Oftentimes parents of students have had bad experiences with Statistics courses and pass on their anxieties to their children. To test whether taking Statistics decreases students’ anxieties about Statistics, an instructor gave a test to rate student anxiety at the beginning and end of his course. Anxiety levels were measured on a scale of 0-10. Here are the data for 16 randomly chosen students from a class of 180 students. Do the data indicate that anxiety levels about Statistics decreases after students Statistics?   Create and interpret a 90% confidence interval. 3 three decimal places.

Q: If a data set has a higher mean than median, which of the following must be true? The data is skewed…

A: Mean is greater than median

Q: A set of 100 values has a median value of 40. What is the value of the 75th percentile in this set…

A: Introduction: Percentiles are used in statistics to divide a set of numerical values into 100 equal…

Q: If a population has a mean of 25, what is the mean of the sampling distribution of its mean. Please…

A: Given,population mean(μ)=25

Q: Why should I learn statistics?

A: Statistics helps us to describe and organize data. It also helps us to make inferences from data.

Q: Briefly explain what is meant by the term “descriptive statistics”.

A: We have to describe descriptive statistics here

Q: Explain why study statistics?

A:

Q: Explain the process of statistics.

A: There are four steps of statistics process :         1. Plan         2. Collect          3. Process…

Q: Can one "trust"

A: Statistics is the study of collecting , analyzing and interpretation of the data.

Q: You are told that your IQ scores falls at the 79th percentile.  What conclusion could you make about…

A: Percentiles: If the elements in the data set are arranged in ascending order of magnitude, then the…

Q: What is an example of the use of statistics to make predictions and decisions in our daily lives?

A: Probability & Statistics can be used in our daily life in many activities like online shopping.

Q: what is statistics- future scenarios in terms of doing project management?

A: Statistics analysis-future scenario helpful in estimation of expecting compeletion time of the…

Q: Explain the two types of observation as used in statistics

A: There are two types of observations: 1) Qualitative observations 2) Quantitative observations

Q: For each student in a study, demographic data are collected, including age, gender, and…

A: For each student in a study, we are collecting the demographic data including age, gender, and…

Q: ?

A: Statistic is similar to mathematics but it can be applied in practical situations. Example, if there…

Q: A circus operator randomly picked 5 day from the month of august to see how many people purchased…

A: Sample is the items randomly drawn from the population.

Q: Dr. Matos sampled her statistics classes and recorded whether each student worked full-time,…

A: Given: out of 20 students Did not work = 3 Worked Full-time = 10 Part time = 7

Q: In this investigation, you learn how to decide if a value of x2 is statistically significant. How…

A: Here we have been provided with two samples falling into various categories. We will use Chi-Square…

Q: could you please tell me why explain in simple terms why the power of a test matters to the users of…

A: Why power test is matters in statistics?  Having  enough statistical  power is necessary  to draw…

Q: What are the real-life applications of Statistics in Business and Economics? Briefly explain at…

A: In many real life situation statistics is very useful in business and economics.

Q: What is the goal of statistics?

A: The main purpose of statistics is to understand the data deeply.

Q: The U.S. Census Bureau reported in that, people annual income for people who never married was…

A: Given that  Sample size n =100 , for each group.

Q: How is the goal of descriptive statistics served by putting scores in a frequency distribution?

A: It is an important part of statistics . It is widely used .

Q: If in a discrete data, 75% of the values are less than 30, then......?

A: we know that,  If Q1 is first quartile then we can say that 25% data points are below Q1. If Q2 is…

Q: Come up with a real-life situation in which you might be curious to know if there is a difference…

A: Null and alternative hypothesis : The null hypothesis could be a claim that's oftentimes created…

Q: what the use of Statistics in your life is. How are you going to be benefitted by studying…

A: Statistics is the science which deals with the collecting, classifying, presenting , comparing and…

Q: The entering SAT scores and high school GPA's of 100 first-year students and their grade point…

A: Given information: The investigator is specially interested to predict the college GPA for next…

Q: How many different arrangements can be formed from the word STATISTICS?

A:

Q: What is the point of statistics? Why do we need it? Why can’t we just look at data by itself?

A: Introduction - Statistics - Statistics is a branch of mathematics which include collection,…

Q: why is it  important for students to know something about statistics as applied to psychology?

A: Yes it is important for students to know something about statistics as applied to psychology…

Q: If Ted scores in the first quartile on his math test, that means he scored better than most students…

A:

Q: A researcher conducts a study comparing anxiety levels in teens based on their social media usage.…

A: Given information: The data represents the descriptive and inferential statistics of anxiety scores…

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: find an example of when statistics were misused/skewed and state the reason why you think the…

A: when statistics were misused/skewed: Misuse can also result from mistakes of analysis that result in…

Q: Discuss how statistics, as a way of organizing and summarizing data, helped make good decisions when…

A: Statistics is the branch is the branch of applied mathematics in which we do collection, analysis,…

Q: what are the applications of statistics on an academic setup?

A: Statistics is the branch of applied Mathematics in which we do collection, interpretation, analysis…

Inverse Normal Distribution

The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.

Mean, Median, Mode

It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.

Z-Scores

A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.