50. The “population” in statistics includes all members of a defined group that we are studying or collecting information on for data driven decisions. A part of the population is called a sample.
a. Hence here 100 days are population
b. Randomly selected 10 days are sample.
50 How many text messages? You would like to know something about how many text messages...
Using Excel - Entering data and computing average You are curious about how many emails you receive in a typical day. You randomly select ten days and count how many emails you received in each. The following table shows the hypothetical results for your sample: Enter a label (such as "Emails Received") in cell A1 of an Excel spreadsheet. Then enter your hypothetical results in cells A2 through All. Your spreadsheet should look similar to the following sample spreadsheet: In...
Imagine you have a large stack of money in sı bills. You want to know how much money you have, and begin counting it at a rate of şı each second. Expressed in what you believe to be the most sensible units how long would it take you to count your money if you have A) million dollars. B) 1 billion dollars? Give an example of something that is a vector quantity and an example of something that 1s a...
Select something you need to forecast in the future. For example, how long it will take to write your thesis, how long it will take to finish your senior design project, or when you expect to receive a job offer. Apply one technique from How to Measure Anythingthat would help you make a better forecast.
You are a politician and would like to know how the percentage of people that support your proposition. You go out and get a random sample of 1000 register voters that are likely to vote in the upcoming election and find out that 300 of them will vote for your proposition. Based upon your observed sample proportion, how many voters would you need to sample if you wanted your margin of error to be 7% with 99% confidence? a) 57...
When doing a Nernst equation, how do you calculate n? I know for something like Zn|Zn2+(1.0 M)||Cu2+(1.0 M)|Cu where you have 2+ and 2+ n would be 2, but what about something like Pb|Pb2+(1.0 M)||Ag+(0.10 M)|Ag where you have 2+ and + I'm confused and can't find an answer anywhere
Suppose that, over a certain period of time, a parent monitors how many texts their 17 year old son sends each day. The average amount of texts sent a day is 42, and the standard deviation is 12 (a) If one day from this time period is randomly selected, and the number of texts for that day is one standard deviation above the population mean, how many texts were sent that day? 54 (whole number) Now, suppose random samples of...
You would like to know what proportion of Canadian undergraduate university students check professor ratings before they register for courses. You survey students who are currently enrolled in undergraduate programs at 7 randomly selected Canadian universities and obtain information from 1778 students (254 students were randomly selected from each of the 7 universities you surveyed). What is the population in this study? O A. All students who are currently enrolled in an undergraduate program at a Canadian university. B. All...
How would you know if you have a source that is valid? Is there something that you know is a red flag in using sources? Wgat makes it a valid source that can be cited in your paper?
A government agency would like to know the average weight of adult catfish in the wild. The need to know how many fish to sample. The population standard deviation is known to be 16.8 lbs from previous studies. (a) Assuming that they would like to be 90% confident of the results, what is the critical value that corresponds to this given level of confidence? Round to two decimals and remember that critical values are defined to be positive. (b) If...
Question text You are comparing how many hours that freshmen and seniors spend watching TV. Suppose you pick a sample of 13 freshmen and 15 seniors and want to calculate a confidence interval on the difference between means. How many degrees of freedom does your t-value have? Select one: b. 26 c. 30 d. 32