Part asked to find the sample correlation coefficient

Q: The mean of 5 observations is 4.4 and the variance is 8.24. If three of the five observations are…

A: Given: Number of observations (n) = 5 Mean x¯=4.4 Variance (s2) = 8.24 The three observations are 1,…

Q: What percent of the department faculty have less than 25 years of service? Answer:  % (b) If a…

A: From the given histogram we need to answer certain questions.

Q: A group of students were surveyed about the number of siblings they have. The frequencies and…

A: Solution: From the given information, the table of frequencies and relative frequencies of their…

Q: In calculating the mode for the grouped data, f, represents

A: In grouped data, the observations are clustered together into classes. The grouped data basically…

Q: Rating Increase $2400 $2600 $1800 Rating Increase $2000 $2600 Auniversity would like to examine the…

A: Given data: Sl. No. Rating (X) X^2Increase (Y) 1 17 2400 2 18 2600 3 12 1800 4 13 1600…

Q: 3. How was the data collected?

A: Data collection is an important part because the whole analysis will depend upon the collected data.…

Q: 1 2 13 r= 4 5 9 3 8 6 5 Calculate the sample correlation coefficient (r) to three decimal places.…

A:

Q: statistics student wanted to find out whether gender and the use of turn signals when driving were…

A: Given n1=857 n2=669 X1=522 X2=488 Alpha=0.05

Q: High blood pressure is a known risk factor for heart attack. A research team investigating ways of…

A: From the given information we have,          denote the age in years as the independent variable.…

Q: A researcher is interested in the effect of climate on the weight of polar bears, and has a dataset…

A: In this study, the researcher is interested to study the effect of climate on the weight of polar…

Q: Which of these would be considered a transformed score? a. percentile ranks and t scores b. z scores…

A: Transformed scores are those scores that have been converted from raw scores to meaningful score…

Q: Aspirin prevents blood from clotting and helps prevent strokes. The Second European Stroke…

A: It is given that both sample sizes are 200, number of strokes for aspirin alone is 60 and number of…

Q: A person scored in the bottom 33% in a test. If the test scores are normally distributed then the…

A:

Q: A researcher asked 850 people what their favourite type of TV programme was business news, general…

A: # The Chi-square test analyzes categorical data. It means that the data has been counted and divided…

Q: Anya gathered a random sample of chips from a popular company. She calculated data on different…

A: Given that Arya gathered a random sample of chips from a popular company and for the data collected,…

Q: Nocaf Drinks, Inc., a producer of decaffeinated coffee, bottles Nocaf. Each bottle should have a net…

A: The provided information is as follows:The data set is given as: SampleSample RangeSample…

Q: What is the value of SP for the following set of data? X         Y 2          1 4          2 9…

A: X       Y       X Y 2 1 2 4 2 8 9 8 72 ∑x=15 ∑Y=11 ∑XY=82

Q: Lecture(12.13): Researchers were investigating anxiety in first year college students.According to…

A: Given information:   Going for a walk/ doing physical activity    Listening to music/ watching a…

Q: A survey among Harvard students was conducted. It is about their starting position when they sleep…

A: Do the collected data represent a sample or population? Explain your answer.

Q: If 50 and 70 are the two elements of a population data set and their z-scores are -2 and 3,…

A: For  X=50, Y=70  Z score= -2 and 3 for point X and Y

Q: Determine the size of each sample. nE = (Type integers or decimals. Do not round.)

A: The size of males is, nM=174+370=544 Thus, the size of males is 544.

Q: What is the standard error of the estimate? A) 1.595 B) 1.666 C) 0.970 D) 1.920   If there was no…

A: Close Friends Self-Esteem Mean 8.90 5.20 SD 3.75 2.15 a = 2.904  and b = 0.258

Q: A report from the National Center for Health Statistics for 2010 showed that 20% of the adult…

A: The objective of this question is to find the average number of adult smokers in a sample of 25…

Q: The histogram below gives the length of service of members of the Department of Biology at a…

A: Given data :  No of years  faculty  0 - 5 5 5 - 10 11 10 - 15 10 15 - 20 2 20 - 25 11…

Q: Compute the coefficient of variation CVar .

A: Given that,  2(red), 4(black), 8(blue), 6(green), 10(orange), 12(black).

Q: Three hundred participants were asked to think of colors and write them down. After a 15 minute…

A: The hypothesis test is used for testing a claim which helps in making important business decisions.

Q: A student measuring how gasoline prices change records the cost of gas at 10 randomly selected…

A: Introduction Data are the nos. that are collected and analyzed to draw meaningful insight from it.

Q: Consider a survey in which 1000 people are asked “How often do you go to the dentist?”  The variable…

A: Given: Number of people that have been involved in the study = 1000

Q: What is the mean and median of the data represented in this Stem and Leaf Display? Round answers to…

A:

Q: The coefficient of variation for the following data is 60, 47, 75, 85, 58 O a. 23.50% O b. 25.23% O…

A: From the data: Mean=65SD=14.9833

Q: For a moderately skewed distribution of supply of Product A, arithmetic mean is 100, and coefficient…

A: Given : Arithmetic mean (Mean)= 100 Coefficient of variation (C.V)= 35% = 0.35 Pearson coefficient…

Q: Calculate the 75% percentiles, 25% percentiles, and the IQR for the following data:   9, 12, 20,…

A: Given : Observation 9 12 20 5 14 7 16 13

Q: The number of mistakes made on a typing test is Normally distributed. Five office employees---Kelly,…

A: On observing the z-score, Stanley made the least mistakes on the typed test because his z-score is…

Q: ONLY PART C AND D PLEASE!

A: Provided data is: Dorms Apartments At Home 8 2 5 9 1 4 7 3 3 8…

Q: A local store owner is interested in finding the mean age of her customers. She randomly surveys 82…

A: Key statistical concepts comprise of knowledge of population, sample, parameter, and statistic.

Q: What is the value of the variance when all the data in the set are equal? a. -1 b. 0 c. 1 d. 100%

A: All the sets are equal.

Q: The correlation between midterm and final grades for 300 students is 0.620. If 5 points are added to…

A: Correlation Coefficient: Let (x1, y1), (x2, y2), ... , (xn, yn) be n set of observations for the…

Q: the data in the table to wer the following ques The candy maker rep ted that 33% Of the candy in the…

A: a part Total Number of candies = 37  Red candies = 10 p^=1037=0.27 The proportion of red candies are…

Q: Jocelyn believes that the amount of sleep she tends to get on weekends differs from the amount of…

A: School week :  { 7,7.5,8,6.5,8,7.5,7,6.5,7,8 }  N1 =10  df1 = N-1 = 9  Weekend :  {…

Q: A sales manager recorded the number of sales made by each of the 300 salespeople working at his…

A: As per the guidelines, we are only allowed to solve three subparts. Please paste the other subparts…

Correlation

Correlation defines a relationship between two independent variables. It tells the degree to which variables move in relation to each other. When two sets of data are related to each other, there is a correlation between them.

Linear Correlation

A correlation is used to determine the relationships between numerical and categorical variables. In other words, it is an indicator of how things are connected to one another. The correlation analysis is the study of how variables are related. 

Regression Analysis

Regression analysis is a statistical method in which it estimates the relationship between a dependent variable and one or more independent variable. In simple terms dependent variable is called as outcome variable and independent variable is called as predictors. Regression analysis is one of the methods to find the trends in data. The independent variable used in Regression analysis is named Predictor variable. It offers data of an associated dependent variable regarding a particular outcome.