https://padlet.com/330410/vnnof4s7r3np3m6g en-us 2020-05-23 22:26:39 UTC 2024-05-26 00:30:51 UTC hello@padlet.com https://padlet.net/icons/png/1f60c.png 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/590790747 A z-score, also known as a standard score, this value will tell you how far away a data point is from the mean. To calculate it, you need the population mean and population standard deviation. Z-scores can range from -3 standard deviations  to 3 standard deviations.]]> 2020-05-23 22:31:12 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/590790747 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/590793390 The y-intercept is part of the equation for a regression line(ŷ=a+bx). The y-intercept is the predicted value when x=0.]]> 2020-05-23 22:37:43 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/590793390 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/590804430 X-bar is a symbol that represents the mean, specifically the sample mean. To find the value of x̄, you must divide the sum of the observations by the sample size (n).]]> 2020-05-23 23:03:16 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/590804430 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/590806678 A weighted average is a way to calculate mean when some numbers in the data set carry more importance (weight) than others.]]> 2020-05-23 23:09:04 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/590806678 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/590810357 Variability is how much the data set vary from the average value. The most common measures of variability are the range, the interquartile range (IQR), variance, and standard deviation.]]> 2020-05-23 23:18:57 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/590810357 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/590814745 Undercoverage occurs when some groups in the population are left out of the sampling process. This is an example of a sampling error.]]> 2020-05-23 23:30:24 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/590814745 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/590817918 A test statistic is a measurement of  how for a sample statistic varies from the null hypothesis if it were true, in standardized units.]]> 2020-05-23 23:38:59 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/590817918 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/590821445 A simple random sample(SRS) is a sample taken of n individuals from the population chosen in a way that every individual has an equal chance of being selected.]]> 2020-05-23 23:48:22 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/590821445 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/590823546 A residual is the difference between an observed value of the response variable and a predicted value from the regression line. 
residual = observed y - predicted y]]> 2020-05-23 23:53:16 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/590823546 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/592163397 A quantitative variable is  a variable that is represented by numerical values.]]> 2020-05-25 02:54:08 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/592163397 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/592168671 The power of a test against an alternative is the probability that the test will reject the null hypothesis at a given significance level when the alternative is true.]]> 2020-05-25 03:02:53 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/592168671 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593716658 An observational study is a study where researchers observe the effect of a risk factor, diagnostic test, treatment or other intervention without trying to change who is or isn't exposed to it.]]> 2020-05-25 22:33:29 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593716658 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593720506 A normal distribution is described by a normal density curve. It is a symmetric distribution where most of the observations cluster around the central peak and the probabilities for values further away from the mean taper off equally in both directions.  The normal distribution is the most important probability distribution in statistics because it fits many natural phenomena.]]> 2020-05-25 22:38:51 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593720506 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593730719 A margin of error tells you how many percentage points your results will differ from the real population value. For example, a 95% confidence interval with a 4 percent margin of error means that your statistic will be within 4 percent of the real population value 95% of the time.]]> 2020-05-25 22:53:24 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593730719 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593734199 The law of large numbers says that when we observe more and more repetitions of a chance process, the proportion of times that a specific outcome occurs approaches a single value.]]> 2020-05-25 22:58:20 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593734199 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593741709 The probability of two events occurring together, for example, A and B.]]> 2020-05-25 23:08:28 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593741709 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593743938 The interquartile range (IQR) is a measure of variability, based on dividing a data set into quartiles. It contains the middle 50% of the dataset. It is calculated by subtracting the first quartile from the third quartile.]]> 2020-05-25 23:11:19 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593743938 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593746297 A histogram is a graphical display of data using bars of different heights. In a histogram, each bar groups numbers into ranges. Taller bars show that more data falls in that range. A histogram displays the shape and spread of continuous sample data.]]> 2020-05-25 23:14:40 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593746297 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593749099 A geometric setting occurs when we perform independent trials of the same chance process and record the number of trials until we receive a success.]]> 2020-05-25 23:18:31 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593749099 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593754082 A summary consists of five values: the most extreme values in the data set (the maximum and minimum values), the lower and upper quartiles, and the median.]]> 2020-05-25 23:24:52 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593754082 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593758603 In those cases, the explanatory variable is used to predict or explain differences in the response variable. In an experimental study, the explanatory variable is the variable that is manipulated by the researcher.]]> 2020-05-25 23:31:02 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593758603 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593937038 A dot plot is a graphical display of data using dots. Dot plots are used to display quantitative data. ]]> 2020-05-26 03:10:55 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593937038 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593940309 A confounding variable is an “extra” variable that you didn’t account for. They can ruin an experiment and give you useless results. ]]> 2020-05-26 03:15:51 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593940309 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593942323 Bias is the tendency of a statistic to overestimate or underestimate a parameter. Bias can be introduced due to sampling or measurement errors, or unrepresentative samples. ]]> 2020-05-26 03:19:14 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/593942323 330410 https://padlet.com/330410/vnnof4s7r3np3m6g/wish/595954699 An alternative hypothesis directly contradicts the null hypothesis. ]]> 2020-05-27 01:17:39 UTC https://padlet.com/330410/vnnof4s7r3np3m6g/wish/595954699