A survey was conducted to find out mean expenditure of students in a week. Data collected from a sample of 35 students gives a mean expenditure of RM80 and standard deviation RM15. Construct a 99% confidence interval for the mean expenditure of all students. Interpret your answer.

Q: On a final  examination in mathematics , the mean was 72  and standard deviation was 15 . Determine…

A: given information: μ=72σ=15x=65 we want to determine the z score . z=x-μσ  =65-7215  =-0.4667

Q: for this set of data, the standard deviation is equal to: 9,8,10,5,5,2,3,6,3

A: Mean:The formula for finding mean is shown below:

Q: What is the corresponding Z- score, mean is 110, standard deviation is 8 and x is 90

A: In question, We'll find the Z - score for mean 110, standard deviation 8 and x = 90. The solution is…

Q: u and your friend have recently taken two different standardized mathematics exams. You scored 92 on…

A: The mean = 100The standard deviation = 10

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

A: Given Information: Mean SI score for population of all smokers, μ0 = 82 Standard deviation score for…

Q: What is the 80th percentile if the mean is 3 and the standard deviation is 0.6

A: It is given that µ= 3, σ= 0.6.

Q: Doug has 1,000 bottle caps in his collection compared to Melissa's 2000 bottle caps. If the average…

A: Given,mean(μ)=1250standard deviation(σ)=500Doug bottle cap collection(X)=1000Melissa's bottle cap…

Q: To compare the braking distances for two types of tires, a safety engineer conducts 35 braking tests…

A: Given that Type A n1 = 35 x1=42 σ1=4.7   Type B n2=35 x2=45 σ2=4.3   l.o.s.=α=0.10

Q: Two classes took a statistics test. Both classes had a mean score of 73. The scores of class A had a…

A: Given: Two classes took a test. Mean score of both classes is 73. Standard deviation of A and B is 5…

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 SAT and ACT are standardized tests for college admission in the United States. Both tests…

A: Percentile of Sam's score is given by the cumulative probability of observing a score of at least…

Q: If the main effect of age is significant, describe the main effect of age. Include the overall means…

A: Main effect in the Analysis of Variance test is the effect of one the independent variable on…

Q: The mean number of English courses taken in a two-year time period by male and female college…

A: From the Part (iii), the null hypothesis is rejected.

Q: Michelle, a primary school teacher, administered an age-appropriate IQ test to all of her students…

A: Given information: The true population mean for the IQ test Michelle administered is 100, with a…

Q: In a survey, 17 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: A psychologist has developed a new test of spatial perception and she wants to estimate the mean…

A:

Q: Give two situations in which comparing two population standard deviations would be important

A: Two situations in which comparing two population standard deviations would be important is obtained…

Q: What is the percentile rank of the score 65?   In an English test , the mean is 60 and the…

A: Given X=65μ=60σ=6

Q: You have a data set with mean = 40 and standard deviation = 3. What can you say about the percentage…

A: Given  μ=mean=40, sd=σ=3 P(32<X<40)= ?  Note: this probability value calculated from standard…

Q: A student researcher wants to determine whether the mean score in Mathematics of the 25 students in…

A: Confidence interval are used to measure the range where the true parameter lies. It measure the…

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: Suppose that we conduct a survey of 19 millionaires to find out what percent of their income the…

A:

Q: In hundreds of studies with many thousands of participants, first-born children scored better than…

A: Solution: Given information: x1= 469  Sample mean of first born x2= 456  Sample mean of second born…

Q: A student takes a test in his math course and scores 45 points and a test in his psychology…

A: Introduction:Consider X as a normally distributed random variable, with mean μ and standard…

Q: Person A scores 78 on an exam that has a mean of 70 and a standard deviation of 5. Person B scores…

A: Given that.   X~N( μ , ?^2 )   Z-score =( x - μ )/?

Q: If the mean snowfall for Ottawa Ontario Canada is 98 inches per year and the standard deviation is…

A: Given,mean(μ)=98standard deviation(σ)=25

Q: If a student scored 77 points on a test where the mean score was 84.5 and the standard deviation was…

A: Given: Score of student(x)=77Population meanμ=84.5Population standard deviationσ=5.1

Q: Let population 1 be all males in the country and let population 2 be all females in the country. The…

A: We need to construct the 90%90\%  confidence interval for the difference between the population…

Q: Please also explain why you determined whether or not the results are statistically significant.…

A: From the given information we conduct Hypothesis test.

Q: The daily water usage per person in Davao City is normally distributed with a mean of 20 gallons and…

A: Empirical Rule : The empirical rule, also referred to as the three-sigma rule or 68-95-99.7 rule, is…

Q: Do you prefer taking tests on paper or online? A college instructor gave identical tests to two…

A: It is assumed that the population variances are equal. The null and alternative hypotheses are…

Q: In a random sample of 2500 men being treated for obesity, the mean total cholesterol level is 175…

A:

Q: Rebecca and Emma began arguing about who did better on their tests, but they couldn't decide who did…

A: Rebecca earned a test grade of 71 in English. The mean and standard deviation of test grades in…

Q: When you have significant results in data analysis, it is customary to report all relevant means and…

A: Data Analysics is a process of inspecting, cleansing, transforming, and modeling data with the goal…