8,960 Answered Questions for the topic statistics

Statistics

12/12/22

p-value test, a critical value test, and a confidence interval test.
A statistic professor at UCSD where statistics classes have 350 students, gave his students a satisfaction survey on self-evaluation of how much they learned in the class. The survey was a rating... more
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Statistics

12/12/22

Hypothesis testing

For the following, find the p-value and the critical value to test the null-hypothesis. a. The test statistic is Z = -2.5 with a claim that the population p < 0.75, and α = .05. b. The test... more
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Statistics

12/12/22

finding sample size statistic
The Oxford IQ test is designed to have a mean of 100 pts and a standard deviation of 15 for normal adults. Find the sample size necessary to estimate the mean IQ score of college professors. We... more
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Statistics

12/12/22

Confidence Interval

Listed below are the arrival delays (in minutes) of randomly selected United Airlines flights from JFK to SFO. Negative numbers mean that flights arrived that many minutes early based on their... more
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Statistics

12/12/22

Confidence interval of population mean
1) In a test of the Keto weight loss program, 40 adults used the diet program and after 12 months their mean weight loss was 4.7 lbs, with a sample standard deviation of 3.56 lbs. Construct a 95%... more
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Statistics Spss

12/12/22

What test to run in SPSS?
  Are reading scores, writing scores, math scores and science scores related?
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Statistics

12/10/22

A distribution of values is normal with a mean of 6.7 and a standard deviation of 21.8. Find P71, which is the score separating the bottom 71% from the top 29%.
I am super confused on how to solve this problem... any help?
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Statistics Test Preparation

12/10/22

You are conducting a study to see if the proportion of voters who prefer Candidate A is significantly less than 0.77. You use a significance level of α = 0.002 .
You are conducting a study to see if the proportion of voters who prefer Candidate A is significantly less than 0.77. You use a significance level... more
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Statistics

12/10/22

find the area in the right tail more extreme than z=-2.64 in a standard normal distribution
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Statistics Probability

12/10/22

What type of hypothesis?
A teacher wanted to know if her student ice cream preference was different than in previous years. The pie chart below represents the previous percentages. This year, 32 chose vanilla, 31 chose... more
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Statistics

12/09/22

treu or false statement about mean
the number of values smaller than the mean is equal to the number of values that exceed it
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Statistics

12/09/22

Probability Coin Test

Two biased coins are tossed 144 times. 50 trials are both heads and 39 trials are both tails out of these 144 trials. Among the rest, 25 trials have head in the first coin while tail in the second... more
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Statistics English Writing

12/09/22

In need of a tutor for writing an annotated bibliography on a journal article for a statistics course:
Within the academic journal article I must find and define: -Highlighting the independent, dependent, operational definition of both, threats to internal validity, external validity and construct... more
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Statistics Probability

12/08/22

I NEED THIS ANSWERED ASAP! THANK YOU IN ADVANCE!
The table below lists salaries (in thousands of dollars) from a sample of people with degrees in 3 different... more
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Statistics Probability

12/08/22

I NEED THIS ANSWERED ASAP!! THANK YOU IN ADVANCE!
16. The table below lists the results of 200 rolls of a 6-sided die. Use a chi-square goodness of fit test to determine if the die is fair (and thus each side is equally likely to be observed). Use... more
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Statistics Probability

12/08/22

I NEED THIS ANSWERED ASAP!! THANK YOU IN ADVANCE!!
Muriel Bristol says that milk should be poured first into tea and, conversely, that tea should NOT be poured into milk and that she can tell the difference. To test this claim, outside of the view... more
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Statistics Probability

12/08/22

I NEED THIS ANSWERED ASAP!! THANK YOU IN ADVANCE!!
2. Using the same data on NFL stadium seating capacity from the data set on Blackboard, answer the following questions. (https://www.stadiumsofprofootball.com/comparisons/).a) Plot a... more
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Statistics Math Biostatistics

12/07/22

STATISTICS CHAPTER 8
According to a study conducted,the proportion of americans who were afraid to fly in 2012 was 0.10. A random sample of 150 americans resulted in 13 indicating that they were afraid. Explain why... more
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Statistics Biostatistics

12/07/22

From a full deck of cards, you are dealt two cards. What is the probability of getting i) A king and a Queen? ii) Two cards from the same suit? iii) A king and a Queen from the same suit?
From a full deck of cards, you are dealt two cards. What is the probability of gettingi) A king and a Queen?ii) Two cards from the same suit?iii) A king and a Queen from the same suit?
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Statistics

12/07/22

statistics hypothesis testing
 Pain medications sometimes come with side effects. One side effect is dizziness. A researcher wanted to determine if some pain medications produced more or less dizziness than others. The results... more
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Statistics Biostatistics

12/06/22

Biostat/ stat --> Discrimination / calibrarion
what is the difference between calibration and discrimination in data analysis? an dhow do we measure them
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Statistics Biostatistics

12/06/22

From a full deck of cards, you are dealt two cards. What is the probability of getting i) A king and a Queen? ii) Two cards from the same suit? iii) A king and a Queen from the same suit?

From a full deck of cards, you are dealt two cards. What is the probability of gettingi) A king and a Queen? ii) Two cards from the same suit? iii) A king and a Queen from the same suit?
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Statistics

12/05/22

Need help on this please!!
In a survey, 25 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $42 and standard deviation of $8. Construct a... more
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Statistics

12/05/22

Need help on this !!
In a survey, 12 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $36 and standard deviation of $9. Find the margin of... more
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Statistics Data Science

12/05/22

plotting a bell curve with percentile information
I have three sets of numbers representing a minimum, 25th percentile, a mean, a median, 75th percentile and a maximum. While I do not have any individual raw data and do not know the standard... more
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