Many students face the problems when they start studying the Statistics and Probability subject. Trying to understand a lot of different aspects they feel stressed and that doesn’t have a beneficial effect on their health. Students have a great deal of statistics and probability questions that they puzzle over every day. Our service will provide every client with the statistics and probability answers. We promise to do our best to help you solve your statistics and probability problems, just let us know your problem and you will get the best statistics and probability answers ever!
Conduct a survey involving two
variables with at least 15 respondents. Put the data in a table identifying the
independent and dependent variables, then construct a scatter plot. As part of your
advance study, determine the shape, trend, and variation of the variables involved.
rashmi dhar, manufacturer and seller of kashmiri kawha through e-commerce websites.
she wanted to know the effect of her spending in advertiesment of 'kahwa' on the sales, along with the other factors 'numer of rpresntatives . ' customer - satifaction ratings'. for this research she has gathered the sales data in the folowing table along with other necessary information
according to its label, each coffee bag in a box contains 4g of coffee powder.in actual fact, the mass of coffee powder per bag has a mean 4.05g and a standard deviation of 0.05g. assuming that the mass of coffee powder in each bag is distributed normally, calculate the expected number of coffee bags which contain 3.95g to 4.10g of coffee powder in a box of 300 bags.
Form a group of five students in your class. Determine the
General Math average of the members of the group. List them.
Use a separate sheet of paper.
1. List all possible samples of size 2 and their corresponding means.
2. Construct the sampling distribution of the sample means.
3. Calculate the mean of the sampling distribution of the sample means. Compare this to the mean of the population.
4. Calculate the standard deviation of the sampling distribution of the sample means. Compare this to standard deviation the mean of the population
The main purpose of statistics is to test theories or results
from experiments. For example,
You might have invented a new fertilizer that you think makes
plants grow 50% faster.
In order to prove your theory is true, your experiment must:
a. Be repeatable
b. Be compared to a known fact about plants (In this example,
probably the average growth rate of plants without the fertilizer).
The rejection region (also called a critical region) is a part of the
testing process. Specifically, it is an area of probability that tells you if
your theory (hypothesis) is probably true.
=> Illustrate the rejection region(s), using your invented fertilizer
data aforementioned for the following questions:
1. Is the average growth rate greater than 10cm a day?
2. Is the average growth rate less than 10cm a day?
3.Is there a difference in the average growth rate in both directions
(greater than and less than)?
‘Bhartdarshan’ is an Internet-based travel agency wherein customers can see videos of the cities they plan to visit. The number of hits daily is a normally distributed random variable with a mean of 10,000 and a standard deviation of 2,400.
a. What is the probability of getting more than 12,000 hits?
b. What is the probability of getting fewer than 9,000 hits?
a.Make an assumption on the average weekly allowance of Grade 11 students.
b. Conduct a survey on your desired sample size.
c. Find the sample mean and sample standard deviation.
d. Set level of significance at 0.05
e. Follow the 5-step process of hypothesis testing ( use your assumption in formulating your own Ho & Ha)
1. The teacher would like to find out if there is significant difference in the performance of the male and female students in 35 item test in English. He wants to consider 0.005 level of significance. The result is shown below:
sample size = 8
sample mean = 24.27
standard deviation = 9.36
sample size = 7
sample mean = 21.07
standard deviation = 8.25