When 75 patients were randomly selected, the mean length of wait time was found to be 28 days and the standard deviation was 5.6 days. Because of waiting issues, wait times would slightly go up. What would be the steps to test the claim that wait times have a mean of LESS THAN 38 days if you used a 0.05 significance level?

An experiment was conducted to see the effectiveness of two antidotes to three different doses of a toxin. The antidote was given to a different sample of participants five minutes after the toxin. Twenty-five minutes later the response was measured as the concentration in the blood. What can the researchers conclude with α = 0.01?

a) What is the appropriate test statistic?
---Select--- na one-way ANOVA within-subjects ANOVA two-way ANOVA

b) Compute the appropriate test statistic(s) to make a decision about H₀.
Antidote: critical value =  ; test statistic =
Decision:  ---Select--- Reject H0 Fail to reject H0

Dose: critical value =  ; test statistic =
Decision:  ---Select--- Reject H0 Fail to reject H0

Interaction: critical value =  ; test statistic =
Decision:  ---Select--- Reject H0 Fail to reject H0

a team of educational researchers want to assess the learning outcomes of courses that are offered in traditional face-to-face classroom as compare with online sections. section 1 (traditional classroom) consisted 101 students and section 2 (online class) were 105 students. At the end of the semester the researchers measured achievement scores. students in section 1 had an average of 85 with standard deviation of 6.5 and section 2 (online) earned an average of 78.0 with standard deviation of 9.5. is there a significant difference between the traditional and online class outcomes? at 95% level, apply five-step hypothesis testing and interpret the result.

Suppose the average female brain size (in cubic centimeters) is estimated to be 3370cubic centimeters. A 1905 study by R.J. Gladstone measured the brain size of 103randomly selected deceased female subjects. The data provided show the brain sizes of each of the subjects.

Click to download the data in your preferred format.

Excel:

problem 08-23 Algo (Using Regression Analysis for Forecasting

Quarter:1,2,3,4

year 1: 2,0,5,5

year 2: 5,2,8,8

year 3: 7,6,10,10

Can you please show me how to step up excel spreadsheet for this problem. How to figure out the problems on this question.

Use a α = .01 significance level to test the claim that 90% students have a Facebook account. Survey results: n=500, x= 430.

H0=

H1=

Left tail, right tail or two tail? Explain, please!

Test statistic:

P-value:

Conclusion:

You wish to determine the GPA of students at your school. Describe what process you would go thru to collect a sample if you use a stratified sample.

Zippy Cola is studying the effect of its last advertising campaign. People chosen at random were called and asked how many cans of zippy cola they hand bought and advertisements they had either read or seen of zippy cola in the past week Number of ads 3, 7, 4, 2, 0, 4, 1, 2 Cans purchased 11, 18, 9 ,4,7 ,6,3 ,8 what are the independent and dependent variables and also calculate slope and intercept

The Japanese harvester beetle has infected several forests in the Northwest. Official estimates are that 17% of trees are infected. You are a park ranger who has been seeing a lot of these beetles lately, and you think the rate is higher in your area. You check 400 trees around your cabin and find that 79 of them are infected.

• Go through the steps on the Hypothesis Test Guide (D2L). List each step like Step 1, Step 2, etc.
• Please check the conditions using complete sentences.
• Please do the calculations out the long way, but definitely use GeoGebra or a calculator stats package to check.
• Even if the conditions aren’t met, do the rest anyway.
• Use α = 0.03

PLEASE ANSWER PARTS A, C, AND D. Thank you!

2.2 For diagnostic testing, let X = true status (1 = disease, 2 = no disease) and Y = diagnosis (1 = positive, 2 = negative). Let πi = P (Y = 1|X = i), i = 1, 2.

a. Explain why sensitivity = π1 and specificity = 1 − π2.

c. For mammograms for detecting breast cancer, suppose γ = 0.01, sensitivity = 0.86, and specificity = 0.88. Given a positive test result, find the probability that the woman truly has breast cancer.

d. To better understand the answer in (c), find the joint probabilities for the 2 × 2 cross-classification of X and Y . Discuss their relative sizes in the two cells that refer to a positive test result.

In the casino version of the traditional Australian game of two-up, a spinner stands in a ring and tosses two coins into the air. The coins may land showing two heads, two tails, or one head and one tail (odds). Players can bet on either heads or tails at odds of one to one. Therefore, if a player bets $1 on heads, the player will win $1 if the coins land on heads but lose $1 if the coins land on tails. Alternatively, if a player bets $1 on tails, the player will win $1 if the coins land on tails but lose $1 if the coins land on heads. If the coins land on odds, all bets are frozen and the spinner tosses again until either heads or tails comes up. If five odds are tossed in a row all players lose.

(a) Construct the probability distribution respresenting the different outcomes that are possible for a $1 bet on heads.

(b) Construct the probability distribution respresenting the different outcomes that are possible for a $1 bet on tails.

(c) What is the expected long-run profit (or loss) to the player?

A researcher wanted to test the effectiveness of three different doses of medication on depression levels, so she recruited 60 people and split them evenly into the 3 groups. Below an ANOVA summary table from his hypothetical experiment. Use this table to answer questions below.

Using the information in the table (be sure to fill in, see other ANOVA table based essay question), test for significance (α=0.05). Please state the null hypothesis, research hypothesis, F obtained, F critical, df used, and conclusion of the study.

The random variable X represents the volatility of stocks in the S&P 500. The pdf of X is suspected to have the form:

f(x) = 4cxe^-(cx)^2, x > 0

Determine the value(s) of c so that the above function a valid probability density function

Suppose that a sample space consists of ? equally likely outcomes. Select all of the statements that must be true.

a. Each outcome in the sample space has equal probability of occurring.

b. Any two events in the sample space have equal probablity of occurring.

c. The probability of any event occurring is the number of ways the event can occur divided by ?.

d. Probabilities can be assigned to outcomes in any manner as long as the sum of probabilities of all outcomes in the sample space is 1.

The mean hourly wage for employees in goods-producing industries is currently $24.57 (Bureau of Labor Statistics website, April, 12, 2012). Suppose we take a sample of employees from the manufacturing industry to see if the mean hourly wage differs from the reported mean of $24.57 for the goods-producing industries. a. State the null hypotheses we should use to test whether the population mean hourly wage in the manufacturing industry differs from the population mean hourly wage in the goods-producing industries. 1. 2. 3. Choose correct answer from above choice State the alternative hypotheses we should use to test whether the population mean hourly wage in the manufacturing industry differs from the population mean hourly wage in the goods-producing industries. 1. 2. 3. Choose correct answer from above choice b. Suppose a sample of 30 employees from the manufacturing industry showed a sample mean of $23.89 per hour. Assume a population standard deviation of $2.40 per hour and compute the p-value. Round your answer to four decimal places. c. With = .05 as the level of significance, what is your conclusion? p-value .05, H 0. We that the population mean hourly wage for manufacturing workers the population mean of $24.57 for the goods-producing industries. d. Repeat the preceding hypothesis test using the critical value approach. Round your answer to two decimal places. Enter negative values as negative numbers. z = ; H 0