Construct a 95% confidence interval for the true average monthly claim for travelling expenses made by all salespeople employed by People Plus Pty, if theaverage monthly expenses claim made by a sample of 19 salespeople was R3 500, with a standard deviation of R650. Interpret your answer

Q: One year Thomas had the lowest ERA (earned-run average, mean number of runs yielded per nine innings…

A:

Q: One year Thomas had the lowest ERA​ (earned-run average, mean number of runs yielded per nine…

A: We have given that  X~N( μ , ?^2 )   Z-score =( x - μ )/?

Q: The Pew Internet and American Life Project surveyed 2227 adults in 2011, asking them about their…

A: It is given that the mean number of text messages sent per day is 40.9 for men, 42.0 for women. The…

Q: 1. What’s the equation of the line you’d use to predict scores on the final based on scores on the…

A: 1. Let x denote the mid-term scores, and y denote the final scores. The slope for the equation is,…

Q: A group of domestic equity mutual funds had a mean return of 6.2% with a standard deviation of 1.8%.…

A: Given information:- μ=6.2, σ=1.8 a)  The P-value for the lowest 16% score = 0.16 Determine the…

Q: A psychologist is studying the self image of smokers, as measured by the self-image (SI) score from…

A: In a statistical hypothesis test, there is a chance of making two types of errors. Below are those…

Q: 4. A recent study of 19 students of San Rafael College showed that the mean of the distance they…

A:

Q: Three years ago the mean price of an existing single family home was 243,757. Determine the null and…

A: Ans: Three years ago the mean price of an existing single-family home was 243,757.         Determine…

Q: What will be the interpretation if correlation (r) has a value of -.5439? At what percent does the…

A: Correlation coefficient "r" measures linear relationship between between two variables. It lies…

Q: The standard deviation may not be greater than the mean. O True O False

A: False: standard deviations may be greater than mean  example: random variable x follow standard…

Q: It seems these days that college graduates who are employed full-time work more than 40-hour weeks.…

A:

Q: It seems these days that college graduates who are employed full-time work more than 40 -hour…

A: Given information- Population mean, μ = 40 Sample size, n = 19 Sample mean, x-bar = 44 Sample…

Q: First, let’s start with a statistical example. Let’s assume that the mean score for a class of 50…

A: Let X be a random variable that represents the scores of the students. Then, it is given that the…

Q: An economist would like to estimate the mean amount of money that a family spends to within $45. If…

A: GivenMargin of Error(E)-45standard deviation(σ)=190α=1-0.93=0.07α2=0.035zα2=1.8119      (from z…

Q: Pyramid Lake is en the Paiute andan Reservation in Nevada. The lake is famous for cuthreat trout.…

A: a)   Assume that μ is the true mean length of trout caught in Lake P.

Q: The deaths attributed to UV radiation have a mean of 141.5 with a standard deviation of 92.1.…

A: Mean = 141.5 Standard deviation = 92.1 Raw score = 343

Q: On Bob's last history test, he had a score of 92.  Bob's z-score was -0.5, and the test's standard…

A: Solution -Given that Score in History test be X=92 Z- Score=-0.50 Standard deviation= 6 Find mean…

Q: Ted had the lowest ERA​ (earned-run average, mean number of runs yielded per nine innings​ pitched)…

A: According to the given information in this question We need to find the z score

Q: based on this graph, would the median be greater than the mean? or the mean gretaer than the median?…

A: Here data is negatively(right) skewedmore data at higher end

Q: One year thomas had the lowest ERA​ (earned-run average, mean number of runs yielded per nine…

A: GivenThomas has an ERA of 2.67 and Sarah has an ERA of 2.99For males,For femalesTo find the z-score…

Q: Prestigious University desires to accept only the top20% of all graduating seniors based on the…

A: Given: μ=500σ=100 The z- value is obtained as below:…

Q: seems these days that college graduates who are employed full-time work more than  40 -hour weeks.…

A:

Q: A marketing consultant is hired by a major restaurant chain wishing to investigate the preferences…

A: Given information: Margin of error is m=1.00 Standard deviation is 3.50. Confidence level is 90%.…

Q: Sally had a z score of +0.25 on a test with a mean of 62 and a standard deviation of 5. What was her…

A: From the provided information,Z score = +0.25

Q: A researcher wants to know if men have a lower anxiety level than women in response to social…

A: a)To test:H0:μ1=μ2H0:μ1<μ2

Q: It seems these days that college graduates who are employed full-time work more than 40-hour weeks.…

A: Given data is appropriate for testing of hypothesis to test t-test for single mean. because it is a…

Q: Suppose that salaries for recent graduated of one university have a mean of $25,500 with a standard…

A:

Q: Suppose you compared 2 independent samples. The first sample contained 10 people, had a mean score…

A: Given that,mean(x)=37.6standard deviation , s.d1=1.5number(n1)=10mean(y)=34.2standard deviation,…

Q: It seems these days that college graduates who are employed full-time work more than 40-hour weeks.…

A: We have to test claim.

Q: A government board examination has a mean score of 500 points. A review school promises improved…

A: Let μ denotes the population mean score. The government board examination has a mean score of 500…

Q: Imagine that every elementary school in California is measured on several characteristics and then…

A: From the provided information, Mean (µ) and standard deviation (σ) of the school in Los Angeles…

Q: A local firm reported that an American family of four washes an average of 2000 pounds of clothes…

A:

Q: ne year Terry had the lowest ERA (eamed-run average, mean number of runs yielded per nine inhings…

A: According to the given information in this question we need to find the z scores of both

Q: Suppose that the quarterly sales levels among healthcare information systems companies are…

A:

Q: Assume that an intelligence test scores are distributed normallt with a mean of 100 and a standard…

A: Standard normal distribution: The standard normal distribution is a special case of normal…

Q: It seems these days that college graduates who are employed full-time work more than 40-hour weeks.…

A: The independent variable is respondents. The dependent variable is the number of hours worked per…

Q: An economist would like to estimate the mean amount of money that a family spends to within $36. If…

A: Given that  Population standard deviation =200 Margin of error =E =36 91% confidence.

Q: The mean and standard deviation of 20 items was found to be 10 and 2, respectively. Later, it was…

A: Given that, the mean and standard deviation of 20 items was found to be 10 and 2 respectively. But,…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.