Calculate the volume of 0.5M solution of NaOH that need to be added to 100 mL of 0.2M solution of H3PO4 to get pH = 3. Calculate the ionic strength of resulting solution?

There are 100 balls of the same shape and same weight in one bag. The balls' colors are different: 15 red balls, 25 yellow balls, 40 blue balls and 20 white balls. You are blindfolded and asked to draw three balls from the bag without replacement. Calculate the probability that there is exactly one white ball among the three balls.

explain in details why is it not possible to have 100% safety in case of disaster.

if you have 100 ml of HA with a pKa of 2.91, and 30.00 mL of 0.200M NaOH was needed to reach the equivalence point at pH 7.7. What was the initial pH right before you started the titration?

The vapor pressure of the dietary ether is 100 Torr at -115 ° C and 400 torr at 17.9 ° C

a)Calculate the heat of vaporization and the normal boiling point in a city where the barometric pressure is 620 torr

b) Calculate the entropy of vaporization at the boiling point

c) ΔG of vaporization at 25 ° C

assume that IQ score are randomly distributed with a mean of 100 and a standard deviation of 15 . if 49 are randomly find the probability that their mean IQ score is greater than 98

The Wechsler IQ test is designed so that the mean is 100 and the standard deviation is 15 for the population of normal adults. Listed below are IQ scores of randomly selected professional pilots. It is claimed that because professional pilots are a more homogeneous group than the general population, they have IQ scores with a standard deviation less than 15. Test that claim using a 0.05 significance level. 121 116 115 121 116 107 127 98 116 101 130 114 Identify the test statistic, -value or critical value, conclusion about the null hypothesis, and final conclusion that addresses the original claim. Assume that a simple random sample is selected from a normally distributed population.

A tsunami with a 2 m amplitude (A) and 100 km wavelength (L) is approaching an island coast traveling through 1000 m deep water. An oceanographer quickly applies the equation c=sqrt[gL/(2pi)] to figure out the phase speed (c) is 400 m/s. Observations later show that the tsunami arrived 4 times slower than the oceanographer’s predictions. Did the oceanographer do something fundamentally wrong or was this the best theoretical prediction someone could make quickly? Explain your answer in detail. Also, calculate the period (T) of this tsunami.

2. A random sample of 100 patients with virus found that it was fatal in 18 people and 182 people eventually made a full recovery. In a random sample of 300 SARS patients, 34 died.

a.) Verify your conditions for inference

b.) Calculate a 90% confidence interval for the true mean difference in the proportion of virus cases that were fatal and the proportion of SARS cases that were fatal.

c.) If you were to create a 95% confidence interval, would it be wider or narrower?