1. Is there evidence of diffetence in mean time spent exercising between males and females? In the sample, we have a mean of 12.4 hours a week for 20 males and a mean of 9.4 hours a week for 30 females. 2. Is there evidence of a negative correlation between blood pressure and heart rate? In a sample of 200 2. Is there patients, we found a sample correlation of -0.057.

inurbandojoa 2022-11-18 Answered
1. Is there evidence of diffetence in mean time spent exercising between males and females? In the sample, we have a mean of 12.4 hours a week for 20 males and a mean of 9.4 hours a week for 30 females.
2. Is there evidence of a negative correlation between blood pressure and heart rate? In a sample of 200 2. Is there patients, we found a sample correlation of -0.057.
You can still ask an expert for help

Want to know more about Probability?

Expert Community at Your Service

  • Live experts 24/7
  • Questions are typically answered in as fast as 30 minutes
  • Personalized clear answers
Learn more

Solve your problem for the price of one coffee

  • Available 24/7
  • Math expert for every subject
  • Pay only if we can solve it
Ask Question

Answers (1)

Paskcreessy4k5
Answered 2022-11-19 Author has 20 answers
Null Hypothesis H 0 ( P 1 = P 2 )
Alternative Hypothesis H 1 ( P 1 < P 2 )
n 1 = 20 P 1 = 12.4 n 2 = 30 P 2 = 9.4 P = n 1 P 1 + n 2 P 2 n 1 + n 2 = 20 × 12.4 + 30 × 9.4 20 + 30 = 10.6
Expected value of ( P 1 P 2 ) is 0 and
S.E of P 1 P 2 = p q ( 1 n 1 + 1 n 2 ) = 12.4 × 9.4 ( 1 20 + 1 30 ) = 3.116 Z = P 1 P 2 S . E = 12.4 9.4 3.1166 = 0.962587
P value 0.167879 (onetailed)
The result is not significant at P<0.05
2. t test= n 2 1 r 2 r
200 2 1 ( 0.057 ) 2 0.057 = 0.803367
P value is 0.21138 (onetailed)
The result is not sihnificant at P <0.05
Did you like this example?
Subscribe for all access

Expert Community at Your Service

  • Live experts 24/7
  • Questions are typically answered in as fast as 30 minutes
  • Personalized clear answers
Learn more

You might be interested in

asked 2021-08-20
Let X be a normal random variable with mean 12 and variance 4. Find the value of c such that P{X>c}=.10.
asked 2021-08-19
Let X represent the difference between the number of heads and the number of tails obtained when a coin is tossed n times.
What are the possible values of X?
asked 2021-08-19
Based on the Normal model N(100, 16) describing IQ scores, what percent of peoples
asked 2022-02-12
A card is drawn from a standard deck. A second card is drawn, without replacing the first card. Consider the following events: Event A=The first card selected is red. Event B=The second card selected is black. What word describes the relationship between events A and B?
asked 2021-09-11
An automobile manufacturer is concerned about a fault in the braking mechanism of a particular model. The fault can, on rare occasions, cause A catastrophe at high speed.
The distribution of the number of cars per year that will experience the catastrophe is a Poisson
random variable with λ=8.
asked 2021-11-17
Calculate the following probabilities by expressing them with the appropriate notation. a) The probability of a 20-year-old person to live for at least 25 years b) The probability that a 30-year-old will die within the year following the age of 45 c) The probability that a 35-year-old person dies between the ages of 60 and 70 d) The probability that a 45-year-old will die within 5 years
asked 2022-02-13
A tourist in France wants to visit 10 different cities. If the route is randomly selected, what is the probability that she will visit the cities in alphabetical order?

New questions

i'm seeking out thoughts for a 15-hour mathematical enrichment course in a chinese language high faculty. What (pretty) simple concern would you advocate as a subject for any such course?
historical past/issues:
My students are generally pretty good at math, but many of them have no longer been uncovered to rigorous or summary mathematical reasoning. an amazing topic would be one that could not be impossibly hard for students who have by no means written or study proofs in English.
i have taught this magnificence three times earlier than. (a part of the purpose that i'm posting that is that i have used up all my thoughts!) the primary semester I taught an introductory range theory elegance (which meandered its way toward a proof of quadratic reciprocity, though I think this become in the end too advanced/abstract for some of the students). the second one semester I taught fundamental graph idea and packages (with a focal point on planarity and coloring). The 1/3 semester I taught a class at the Rubik's dice.
the students' math backgrounds are pretty numerous: a number of them take part in contest math competitions, and so are familiar with IMO-fashion techniques, however many aren't. a number of them may additionally realize some calculus, however I cannot assume it. all of them are superb at what in the united states is on occasion termed "pre-calculus": trigonometry, conic sections, systems of linear equations (though, shockingly, no matrices), and the like. They realize what a binomial coefficient is.
So, any ideas? preferably, i'd like to find some thing a bit "sexy" (like the Rubik's cube) -- tries to encourage wide variety theory through cryptography seemed to fall on deaf ears, however being capable of "see" institution idea on the cube became pretty popular.
(Responses specifically welcome from folks who grew up in the percent -- any mathematical subjects you desire were protected within the excessive college curriculum?)