STAT
Suppose you conduct a hypothesis test to determine whether or not the average height of first-grade students is less than 46 inches. You conduct this test at the 0.05 significance level and come to the conclusion that 0.05 < p-value < 0.10. What is the appropriate conclusion?
The data does not provide statistically significant evidence that the average height of first-grade students is less than 46 inches.
What is the appropriate conclusion?
does not provide an associtation
The average GPA for all college students in the United States as of 2006 was 3.11. We want to test to see if the GPA of students at Texas A&M is higher than the national average. Suppose we survey 47 randomly selected students at Texas A&M and the average GPA is 3.27, with a standard deviation of 0.54. Assuming all conditions are met, conduct a hypothesis test at the 0.01 significance level. What is the test statistic?
2.03
What is the expected number of females who said yes?
43.87
For a table of national information regarding a specific country, it is found that the correlation with Internet use is 0.545 for GDP, 0.734 for cellular-phone use, 0.664 for literacy, −0.893 for fertility, and 0.854 for CO2 emissions. Which variable has the weakest linear association with Internet use?
GDP has the weakest linear association with internet use
Brock is interested in determining if 3 different antibiotics have different recovery times. He collected data on 6 patients taking each type of antibiotic (for a total of 18 patients) and ran the test using JMP software (partial results shown in the table below). Assuming all conditions are met, conduct the appropriate hypothesis test using a significance level of 0.01. What value belongs in blank space B?
2
You ask a sample of 155 students, "Should clinical trials on issues such as heart attacks that affect both sexes use subjects of just one sex?" The responses are in the table below. what is the value of the test statistic.
2.03
Cathy wants to see if she can predict house prices based on square footage. She decides to use simple linear regression and gets the output shown below. Assuming all conditions are met, conduct the appropriate hypothesis test at the 5% level to determine if there is a positive linear relationship between square footage and house price. Cathy's house is 2304 square feet and costs 151000 what is the residual for cathys house
21,391.2022
Brock is interested in determining if 3 different antibiotics have different recovery times. He collected data on 6 patients taking each type of antibiotic (for a total of 18 patients) and ran the test using JMP software (partial results shown in the table below). Assuming all conditions are met, conduct the appropriate hypothesis test using a significance level of 0.01. What value belongs in blank space E?
43.14
We would like to test if students who are in the social sciences, natural sciences, arts & humanities, and other fields spend the same amount of time studying for this course. What type of test should we use?
F (ANOVA)
Suppose you conduct a hypothesis test to determine whether or not the average height of first-grade students is less than 46 inches. You conduct this test at the 0.05 significance level and come to the conclusion that 0.05 < p-value < 0.10. 28. What is the correct decision?
Fail to reject the null hypothesis
Suppose you conduct a hypothesis test to determine whether or not the average height of first-grade students is less than 46 inches. You conduct this test at the 0.05 significance level and come to the conclusion that 0.05 < p-value < 0.10. What is the correct decison?
Fail to reject the null hypothesis
The average GPA for all college students in the United States as of 2006 was 3.11. We want to test to see if the GPA of students at Texas A&M is higher than the national average. Suppose we survey 47 randomly selected students at Texas A&M and the average GPA is 3.27, with a standard deviation of 0.54. Assuming all conditions are met, conduct a hypothesis test at the 0.01 significance level. What are the hypothesis
H0 = 3.11 Ha U > 3.11
The 99.7% confidence interval for the mean length of frog jumps is (12.64 cm, 14.44 cm). Which of the following statements is a correct interpretation of 99.7% confidence?
If we were to repeat this sampling many times, 99.7% of the confidence intervals we could construct would contain the true population mean.
Anna Grace is conducting a survey of Texas A&M students. She asks them their age, gender, current GPA, major, current number of credit hours, high school GPAs, and number of days of class they missed in the last month. What kind of variable is major?
Qualitative
Suppose you conduct a hypothesis test to determine whether or not the average height of first-grade students is less than 46 inches. You conduct this test at the 0.05 significance level and come to the conclusion that 0.05 < p-value < 0.10. What is the appropriate conclusion?
The data does not provide statistically significant evidence that the average height of first-grade students is less than 46 inches.
Taylor Swift wants to know the proportion of her fans who listened to her new single ME! within the first hour of it being released. In order to estimate this, she takes a sample of 150 of her fans and asks them if they listened to the song in this time period. Of the 150 fans, 135 of them (90%) responded that they did listen to the song during this time period. What is the parameter and what is its value?
The parameter is the proportion of Taylor Swift Fans who listened to me withing the first hour after it was released, which is unknown
Given the regression output below for predicting the heart weight of cats from body weight, calculate the intercept. Note that the average body weight in the sample is 2.72 kg and the average heart weight is 10.63 grams.
-0.34
Cathy wants to see if she can predict house prices based on square footage. She decides to use simple linear regression and gets the output shown below. Assuming all conditions are met, conduct the appropriate hypothesis test at the 5% level to determine if there is a positive linear relationship between square footage and house price. What is the P-Value
0.0005
The average GPA for all college students in the United States as of 2006 was 3.11. We want to test to see if the GPA of students at Texas A&M is higher than the national average. Suppose we survey 47 randomly selected students at Texas A&M and the average GPA is 3.27, with a standard deviation of 0.54. Assuming all conditions are met, conduct a hypothesis test at the 0.01 significance level. What is the signifagance level?
0.01
You ask a sample of 155 students, "Should clinical trials on issues such as heart attacks that affect both sexes use subjects of just one sex?" The responses are in the table below .What is the signigicange level.
0.01
The average GPA for all college students in the United States as of 2006 was 3.11. We want to test to see if the GPA of students at Texas A&M is higher than the national average. Suppose we survey 47 randomly selected students at Texas A&M and the average GPA is 3.27, with a standard deviation of 0.54. Assuming all conditions are met, conduct a hypothesis test at the 0.01 significance level .Which of the following below best describes the p-value?
0.02< p value< 0.025
The average GPA for all college students in the United States as of 2006 was 3.11. We want to test to see if the GPA of students at Texas A&M is higher than the national average. Suppose we survey 47 randomly selected students at Texas A&M and the average GPA is 3.27, with a standard deviation of 0.54. Assuming all conditions are met, conduct a hypothesis test at the 0.01 significance level. Which of the following best describes the p value?
0.02< p value<0.025
Suppose a researcher wants to test the hypothesis that µ = 25 versus the alternative that µ ≠ 25 using data from a random sample of 95 people. We calculate the standardized test statistic to be 2.087. Which of the following best describes the p-value?
0.04< p value< 0.05
Cathy wants to see if she can predict house prices based on square footage. She decides to use simple linear regression and gets the output shown below. Assuming all conditions are met, conduct the appropriate hypothesis test at the 5% level to determine if there is a positive linear relationship between square footage and house price. What is the signifigance level?
0.05
A health study reported that, in one country, systolic blood pressure readings have a mean of 122 and a standard deviation of 15. A reading above 140 is considered to be high blood pressure. If the systolic blood pressure in that country has a normal distribution, using the z-table, what proportion of the population suffers from high blood pressure?
0.1151
The lengths of human pregnancies from conception to birth varies according to a distribution that is approximately Normal with a mean of 266 days and a standard deviation of 16 days. A study enrolls a random sample of 25 pregnant women. Assuming all appropriate conditions are met, what is the probability that the average pregnancy length of the women in the study is more than 268 days? test statistic
0.2643
A study of moisture and mold spores showed that in general, environments with a higher moisture content had increased number of mold spores. Moisture content explained 64% of the variation in the number of mold spores. What is the numerical value of the correlation between moisture content and mold spores?
0.80
A recent study compared tooth health and periodontal damage in a group of 46 young adult males wearing a tongue piercing and a control group of 46 young adult males without a tongue piercing. One question of interest was whether individuals with tongue piercings had more enamel cracks on average. The summary statistics for the study are shown in the table below (note: not all information in the table is required to solve the problem; you must decide what pieces of information are necessary). Assuming all conditions are met, what is the 99.5% confidence interval for the difference between the number of enamel cracks in the two groups (difference = Tongue Piercing - No Tongue Piercing).
1.1645,4.4355
An index that is a standardized measure used in observing infants over time is approximately normal with a mean of 96 and a standard deviation of 10. What index score is less than 33% of the population index scores?
100.40
The boxplot below shows the distribution of heights of 16 undergraduate statistics students. Using this boxplot, approximately how many students are 64 inches or taller?
12
What is the chi-square contribution for females who said yes?
1.7934
A researcher wants to determine if a new flu vaccine protects people from the flu better than the current vaccine. He has 100 subjects for his study. He believes that sex will affect how well the vaccine works, so within these 100 subjects, splits them up into males (48 subjects) and females (52 subjects). Within each sex, he randomly assigns half of the subjects to get the new flu vaccine and the other half to get the current flu vaccine. What type of study design is this?
Experimental Study: Block Design
The average GPA for all college students in the United States as of 2006 was 3.11. We want to test to see if the GPA of students at Texas A&M is higher than the national average. Suppose we survey 47 randomly selected students at Texas A&M and the average GPA is 3.27, with a standard deviation of 0.54. Assuming all conditions are met, conduct a hypothesis test at the 0.01 significance level. What are the hypothesis?
H0: u= 3.11 Ha: U= >3.11
Which of the following would be the best interpretation of 99% confidence?
If we were to take 100 samples, then approximately 99 would contain the true value of the mean and approximately 1 would not.
Marcos mom measured
extrapolation
What are the appropriate hypotheses?
At least one different
One treatment for strep throat is a tonsillectomy (having the tonsils removed). A research study wanted to determine whether or not having a tonsillectomy reduced the occurrence of strep throat in pediatric patients. They recruited 40 pediatric patients who had a tonsillectomy for their study and for each patient measured both the number of occurrences of strep throat in the year prior to the tonsillectomy (untreated) and the number of occurrences of strep throat in the year following the tonsillectomy (treated). The summary statistics for the study is shown in the table below (note: not all information in the table is required to solve the problem; you must decide what pieces of information are necessary). Assuming all conditions are met, conduct the appropriate hypothesis test at the 0.01 significance level to determine if patients have less cases of strep throat after treatment [difference = untreated (before tonsillectomy) - treated (after tonsillectomy)]. What is the value of the test statistic>
9.6838
In which of the following study designs would you generally know the value of the parameter?
Cenus
One treatment for strep throat is a tonsillectomy (having the tonsils removed). A research study wanted to determine whether or not having a tonsillectomy reduced the occurrence of strep throat in pediatric patients. They recruited 40 pediatric patients who had a tonsillectomy for their study and for each patient measured both the number of occurrences of strep throat in the year prior to the tonsillectomy (untreated) and the number of occurrences of strep throat in the year following the tonsillectomy (treated). The summary statistics for the study is shown in the table below (note: not all information in the table is required to solve the problem; you must decide what pieces of information are necessary). Assuming all conditions are met, conduct the appropriate hypothesis test at the 0.01 significance level to determine if patients have less cases of strep throat after treatment [difference = untreated (before tonsillectomy) - treated (after tonsillectomy)].
H0:ud=0 Ha:Ud>0
Cathy wants to see if she can predict house prices based on square footage. She decides to use simple linear regression and gets the output shown below. Assuming all conditions are met, conduct the appropriate hypothesis test at the 5% level to determine if there is a positive linear relationship between square footage and house price.
Ho= B=0 Ha= B>0 positive so b is greater
One treatment for strep throat is a tonsillectomy (having the tonsils removed). A research study wanted to determine whether or not having a tonsillectomy reduced the occurrence of strep throat in pediatric patients. They recruited 40 pediatric patients who had a tonsillectomy for their study and for each patient measured both the number of occurrences of strep throat in the year prior to the tonsillectomy (untreated) and the number of occurrences of strep throat in the year following the tonsillectomy (treated). The summary statistics for the study is shown in the table below (note: not all information in the table is required to solve the problem; you must decide what pieces of information are necessary). Assuming all conditions are met, conduct the appropriate hypothesis test at the 0.01 significance level to determine if patients have less cases of strep throat after treatment [difference = untreated (before tonsillectomy) - treated (after tonsillectomy)]. Which of the following best describes the p value?
p-value- < 0.0005
