1. Dr Tiago wants to estimate the mean gpa of all incoming freshman. The mean gpa of random sample of 25 freshman is 3 with a standard deviation of 0.72. Assuming that the Gpa of all incoming freshman is normally distributed construct a 95% confidence interval for the population mean u

2. If a random sample of size 25 gives the average of 37.87 and sd of 8 calculate the test static to the test the hypothesis that average hdl-cholesterol level among the adult population of a city is atleat 39.63

Education. Post-secondary educational institutions in the United States (trade schools, colleges, universities, etc.) traditionally offer four different types of degrees or certificates. The U.S. Department of Education recorded the highest degree granted by each of these institutions in the year 2003. The percentages are shown in the table below. A random sample of 300 institutions was taken in 2013 and the number of institutions in the sample for each category is also shown in the table. Conduct a hypothesis test to determine whether there has been any change from the percentages reported in 2003. Round all calculated values to four decimal places.

a. Enter the expected values for the hypothesis test in the table below.

b. Calculate the test statistic for this hypothesis test.  ? z t X^2 F  =

c. Calculate the degrees of freedom for this hypothesis test.

d. Calculate the p-value for this hypothesis test. p-value =

e. What is your conclusion using αα = 0.01?

A. Reject H0H0
B. Do not reject H0H0

A card is drawn from a standard deck of 52 cards. Find the probability that the card is a

Search the Internet and/or the University Library using a phrase such as, "companies that use data analysis." If you choose to utilize the University Library, use the following steps: Click on University Library. Click on the Research Guides tab. Click on Business. Enter a phrase like "companies that use data analysis" in the Enter Search Terms field. Evaluate data analysis and data analytics in a minimum of 700 words, and include the following: Identify two or more organizations that utilize data analysis and data analytics. Identify one or more examples of information being collected and analyzed by the organizations. Assess the importance of data analysis on the successful operation of the organizations. Describe how effective application of data science has grown revenues, increased profits, or led to other positive outcomes for at least one of the organizations.

A bridge on a small, rural road is designed to hold 10 cars when it is full and its maximum continuous weight that the bridge is designed to hold is 39,000 pounds. Assume that the average American car weighs 3750 pounds and that American cars' weights have a standard deviation of 200 pounds. If the bridge is fully loaded with 10 cars, what is the probability that it will be overloaded? Hint: Think about what the bridge designer thought the average weight of car that the bridge would hold would be and remember to draw a picture of the distribution to determine how you are treating the probability!

Do you think that the bridge in the previous question is safe to use? Why or why not?

A study of college football games shows that the number of holding penalties assessed has a mean of 2.2 penalties per game and a standard deviation of 0.8 penalties per game. What is the probability that, for a sample of 40 college games to be played next week, the mean number of holding penalties will be 2.35 penalties per game or more? Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places.

10.21 How do ratings of TV and phone services compare? File Telecom contains a rating of 13 different providers. a. At the 0.05 level of significance, is there evidence of a difference in the mean service rating between TV and phone services?

b. What assumption is necessary about the population distribution in order to perform this test?

c. Use a graphical method (show distribution, rejection and acceptance regions) to evaluate the validity of the assumption in (a).

d. Construct and interpret a 95% confidence interval estimate of the difference in the mean service rating between TV and phone services.

Describe the potential advantages and disadvantages of incorporating additional explanatory variables in a multiple regression model.

The following time series shows the sales of a particular product over the past 12 months. can be found in the below excel file.

https://drive.google.com/file/d/1gIpr0IBYUGgCIRSO7g3mqZ84F89vJU_P/view?usp=sharing

1. Using the three-month moving average, what is the Mean Squared Error (MSE)?

(Round your answer to 2 decimal places. Negative values should be indicated by a minus sign.)

2.  Using the three-month moving average, what is the forecast for month 13 ?

(Round your answer to 2 decimal places. Negative values should be indicated by a minus sign.)

3. Using the exponential smoothing approach for α .3 or .7, what is the Mean Squared Error (MSE)?  

(Round your answer to 2 decimal places. Negative values should be indicated by a minus sign.)

4. Using the exponential smoothing approach for , .3 or .7, what is the forecast for month 13?

(Round your answer to 2 decimal places. Negative values should be indicated by a minus sign.)

5. Using the exponential smoothing approach for , .5 or .5, what is the Mean Squared Error (MSE)?

(Round your answer to 2 decimal places. Negative values should be indicated by a minus sign.)

6. Using the exponential smoothing approach for , .5 or .5, what is the forecast for month 13?

(Round your answer to 2 decimal places. Negative values should be indicated by a minus sign.)

7. Does a smoother constant of .3 or .5 provide more accurate forecasts based on MSE ?

write two paragraph reactions to the suicide

A guidance counselor claims that high school students in a college preparation program have higher ACT scores than those in a general program. The sample mean ACT score for 49 high school students who are in a college preparation program is 22.2 and the sample standard deviation is 4.8. The sample mean ACT score for 44 high school students who are in a general program is 20.0 and the sample standard deviation is 5.4.  

Use an 8% level of significance to conduct test the guidance counselor’s claim. Assume the distribution of ACT scores for both programs are approximately normally distributed. Assume that σ_{college prep}² ‡ σ_general² .  

H₀:                                                                                      Level of significance (α):   α =         

H_A:                                                                                     Type test:     two-tailed    left tail      right tail

Specify the random variable and distribution to be used in this hypothesis test.

Calculate the p-value                                                          Draw a graph and show the p-value

Show your work and any calculator functions used.

Compare the p-value with α                             Decide to Reject or Fail to reject the null hypothesis                   

Conclusion. State your results in non-technical terms.

I have extra columns with data showing up in my pivot table. How can I get rid of the extra columns?

Car battery

The mileage of a car battery is exponentially distributed with a mean value of 10000 km.

(a) What is the probability of a 5000 km trip without replacement of the battery?

(b) What is the maximum length of travel that can be terminated with 90% probability without replacing the battery?

(c) Determine the median, the mean and the variance of the mileage of the battery

Assume that​ women's heights are normally distributed with a mean given by μ=63.5 in​, and a standard deviation given by σ=2.1 in.

​(a) If 1 woman is randomly​ selected, find the probability that her height is less than 64 in.

​(b) If 44 women are randomly​ selected, find the probability that they have a mean height less than 64