The range of the sample data is 1.8 inches (Type an integer or a decimal. Do not round.) The standard deviation of the sample data is (Round to two decimal places as needed)

Find the standard deviation (rounded to the nearest unit) for the data indicated.   Test Score              Frequency 90   1         80   4         70   7         60   6         50   3

A balanced die with six sides is rolled 60 times. Find the mean and the standard deviation of the distribution of X. Interpret

Listed in the data table are IQ scores for a random sample of subjects with medium lead levels in their blood. Also listed are statistics from a study done of IQ scores for a random sample of subjects with high lead levels. Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal. Complete parts (a) and (b) below. Click the icon to view the data table of IQ scores. a. Use a 0.05 significance level to test the claim that the mean IQ scores for subjects with medium lead levels is higher than the mean for subjects with high lead levels. What are the null and alternative hypotheses? Assume that population 1 consists of subjects with medium lead levels and population 2 consists of subjects with high lead levels. X A. Ho: H₁ H₂ H₁ H₁ H₂ c. Ho: M₁ = H₂ H₁: H₁ H₂ The test statistic is 0.56. (Round to two decimal places as needed.) The P-value is (Round to three decimal…

Find the range, the standard deviation, and the variance for the given samples. Round noninteger results to the nearest tenth. 91, 78, 89, 70, 90, 75, 84, 98, 96, 79, 77 range       standard deviation       variance