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In statistics writing, it is common to use Greek letters for:
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If you want to know something about a population, your results would be MOST accurate if your could study the:
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Stack #872810
| Question | Answer |
|---|---|
| In statistics writing, it is common to use Greek letters for: | Population Parameter |
| If you want to know something about a population, your results would be MOST accurate if your could study the: | entire population |
| Probability is defined as: | number of time the outcome or event can occur/ total number of times that any outcome or event can occur |
| If the outcome of event A is not affecteb by event B, then events A and B are said to be | statistically independent |
| A card is drawn from a well-shuffled deck of 52 cards. Find P(drawing an ace or 9) | 2/13 |
| Abag contains 5 red marbles, 3 blue marbles, and 1 green marble. Find P(not blue) | 2/3 |
| which of the following is NOT true of the normal curve? | it is skewed |
| A researcher wishes to consult a 95% confidence interval for a population mean. She selects a simple random sample of size n= 20 from the population. The population is normally distributed and Q is known...Normal distribution. | The calculated confidence interval is wider than the correct confidence interval. |
| A researcher wishes to consult a 95% confidence interval for a population mean. She selects a simple random sample of size n= 20 from the population. The population is normally distributed and Q is known. t distribution | smaller than 95% |
| In how many ways can a girl choose a two-piece outfit from 5 blouses and 6 skirts? | 30 |
| the actual values of the mean, variance, and standard deviation of a population are called: | sample statistics |
| A confidence interval was used to estimate the proportion of statistics students that are females. A random sample of 72 statistics students generated the following 90% confidence interval: (0.438, 0.642). Based on the interval aboce, is the population pr | Maybe. 0.60 is a believable value of the population proportion based on the information above. |
| A university dean is interested in dtermining the proportion of students who recieve some sort of finacial aid. Rather than examine the records for all the students, the dean randomly selcts o... | We are 95% confident that the true proportion of all students recieving financial aid is between 0.52 and 0.66. |
| The Gallup poll correctly predicted George H.W. Bush's 1988 victory using only 4,089 interviews.. | they used random sampling |
| roughly ______ of the total area under the normal curve rests between two standard deviations above and below the mean. | 95% |
| the mean score on a creativity test is 20 and the standard deviation is 5. The distribution is normal. Using the percentage approximations for the normal curve, how many people would attain a score between 15 and 25? | 34%+34%+68% |
| Empirical probabilities are: | based on the normal curve |
| The t distribution | All the above |
| In a symmetrical distribution, what percent of the scores fall above the mean? | 50% |
| In the construction of confidence intervals, if all other quantities are unchanged, an increase in the sample size will lead to a ____ interval | wider |
| Rolling a single die 30 times, keeping track of the "fives" rolled | procedure results in a binomial distribution |
| Choosing 5 people (without replacement) from a group of 23 people, or which 15 are women, keeping track of a number of men chosen. | Not binomial: the trials are not independent. |
| A major department store chain is interested in estimating the average amount its credit card customers spent on their first visit to the chain's new store in the mall.... | A standard normal distribution |
| the width of a confidence interval estimate for a proportion will be | narrower for 90% confidence than for 95% confidence |
| the fact that probabilities are proportions means that they: | can't be lower than zero or more than one |
| When determining the sample size necessary for estimating the true population mean, which factor is NOT considered when sampling with replacement? | the population size |
| the collection of all possible events is called | a sample space |
| suppose 95% confidence interval for u turns out to be (1,000,2,100). Give a definition of what it means to be "95% confident" as an inference. | in repeated sampling, 95% of the intervals constructed would contain the population mean |
| In figuring probabilities, expected relative frequecy is: | the number of successful outcomes divided by the number of total outcomes expected if you repeat an experiment a large number of times |
| If two events are manually exclusive, what is the probabilitie that one or the other occurs? | Cannot be determined from the information given. |
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