# Statistics Help Online

 Our company offers quality and prompt Statistics Help Online. We can solve Stats Problems for you, so you can be sure to have the right solution We provide you with Stats help for any kind of Statistics subjects including Elementary Statistics, Business Statistics, Biostatics, Probabilities, Advanced Statistics, etc. Our service is convenient, efficient and confidential. We can solve Stats problems for you, with guaranteed results. We can help you with your EXCEL, SPSS, SAS, STATA, JMP and MINITAB assignments and projects. Our rate starts $35/hour. We will send you a free quote in hours. Quick turnaround! • Probability • Basic Concepts: Sample Space, Events. • Densities and Distributions. • Descriptive statistics. • Descriptive Analysis of data. • Graphs and charts. • Inferential Statistics • Means, variances, populations, samples. • Intervals of Confidence. • Z-test, T-test and F-tests. • Hypothesis Testing. • ANOVA. • Correlation. • Linear and non-linear regression. • Non-parametric Statistics. • Sign Test. • Wilkinson Tests. • Kruskal-Wallis Test. • Spearman Correlation Coefficient. ## Why we can help with your Stats? #### Experience We have successfully helped customers online for more than 10 years now #### Statistics Expertise We can do handle any type of statistics analyis/homework/questions. Our tutors have real expertise, and big majority of our customers are returning customers #### Step-by-Step Solutions We provide detailed, step-by-step solutions, and we strive to provide exactly what our customers want. #### Free Quote E-mail us your homework problems, we will review them and promptly come back to you with a free quote #### Very Competitive Prices We strive to provide the best possible prices for our services #### We take pride of our work Our tutors take pride on the work we do. We diligenty do work for our customers, and put great attention to details striving to always provide a great final product ## and more... #### Prices Prices start at$25 per hour, depending on the complexity of the work and the turnaround time

You can e-mail us your problems for a free quote.

Sample Problem. The time it takes an international telephone operator to place an overseas phone call is normally distributed with mean 45 seconds and standard deviation 10 seconds.

a. What is the probability that my call will go through in less than 1 minute?

b. What is the probability that I will get through in less than 40 seconds?

c. What is the probability that I will have to wait more than 70 seconds for my call to go through?

Solution:

a. First thing is, let be the time it takes to the telephone operator to place an overseas phone call. The probability we are looking for is

In order to compute this probability, we need to normalize in the following way. We know that has standard normal distribution, so we compute

(notice that since the mean is given in seconds, we have to write 1 minute as 60 seconds)

b. Same as before, let be the time it takes to the telephone operator to place an overseas phone call. The probability we are looking for is

In order to compute this probability, we need to normalize in the same way we did before. We know that has standard normal distribution, so we compute

c. is the time it takes to the telephone operator to place an overseas phone call. The probability we are looking for is equal to

As before, we need to normalize . We get that has standard normal distribution, and we compute

and therefore .