In the table below are the results of a bioassay testing the toxicity of a new insecticide, sufloxaflor, on honey bees in sugar water. Three replicates were completed, the raw data was entered in the table, the mean raw percent mortality was calculated for each concentration of sulfoxaflor. Look at this table then answer the two questions below. RAW DATA CALCULATE % MORTALITY Conc. (ppm) rep 1 rep 2 rep 3 rep 1 rep 2 rep 3 mean alive dead alive dead alive dead 0 9 1 10 0 9 1 0.1 0.0 0.1 0.07 3 7 3 8 2 7 3 0.3 0.2 0.3 0.27 10 8 2 6 4 7 3 0.2 0.4 0.3 0.30 33 6 4 5 5 4 6 0.4 0.5 0.6 0.50 100 1 9 2 8 1 9 0.9 0.8 0.9 0.87 316 0 10 1 9 0 10 1.0 0.9 1.0 0.97 A larger version of this table can be downloaded here: Diode 1. Without using statistical software or log-probit graph paper, which concentration tested is closest to the LC50? 0 ppm 3 ppm 10 ppm 33 ppm 100 ppm 316 ppm

A sociologist wants to determine if the life expectancy of people in Africa is less than the life expectancy of people in Asia. The data obtained is shown in the table below. Africa Asia = 63.3 yr. 1 X,=65.2 yr. 2 o, = 9.1 yr. = 7.3 yr. n1 = 120 = 150

Calcium is essential to tree growth because it promotes the formation of wood and maintains cell walls. In 1990, the concentration of calcium in precipitation in a certain area was 0.15 milligrams per liter (mg/L). A random sample of 10 precipitation dates in 2007 results in the following data table. Complete parts (a) through (c) below. Click the icon to view the data table. (a) State the hypotheses for determining if the mean concentration of calcium precipitation has changed since 1990. Но Ho: 0.15 mg/L H1: 0.15 mg/L i Data Table (b) Construct a 95% confidence interval about the sample mean concentration of calcium precipitation. The lower bound is The upper bound is (Round to four decimal places as needed.) 0.237 0.067 0.224 0.126 0.081 0.131 0.075 0.171 0.314 0.091 (c) Does the sample evidence suggest that calcium concentrations have changed since 1990? Print Done A. Yes, because the confidence interval does not contain 0.15 mg/L. B. Yes, because the confidence interval contains…

The owener of a winery collects data on competing wineries every year.  He would like to predict the gross sales (in number of cases) from the size of the wineries (in acres). What is the explanatory variable in this study?

Arsenic is a chemical element that occurs in many minerals, usually in conjunction with sulfur and metals, and also as a pure elemental crystal. The main use of metallic arsenic is for strengthening alloys of copper and lead. Unfortunately, arsenic occurs in some ground water. In large quantities it is toxic for multicellular life. A mean arsenic level of 8 particles per billion (ppb) is considered safe for agricultural use. A well in Texas is used to water cotton crops. This well is tested regularly for arsenic. A random sample 37 tests gave a sample mean of 7.2 ppb arsenic with standard deviation of 1.9 ppb. Assume that arsenic levels are normally distributed. We are to use the sample data and test if mean arsenic level in the well in question is less than 8 ppb. a. Test statistic isb. The ? − value of the test isc. At the significance level calculated in part c), we conclude that mean arsenic level in thewell is

Can balloons hold more air or more water before bursting? A student purchased a large bag of 12-inch balloons. He randomly selected 10 balloons from the bag and then randomly assigned half of them to be filled with air until bursting and the other half to be filled with water until bursting. He used devices to measure the amount of air and water was dispensed until the balloons burst. Here are the data

Five students provided data regarding the number of hours they spent on studying (TimeStudy) and their GPA. The data are as follows. Answer the following questions.     TimeStudy GPA Student 1 2.00 3.50 Student 2 4.00 3.70 Student 3 5.00 3.30 Student 4 3.00 2.60 Student 5 4.00 3.40 Where SS(residual)=∑i(yi−yˆi)^2 is 0.6829 Calculate (by hand) the SStotal and SSmodel. What does mean by “goodness of fit”?  What is the F-ratio for testing the “goodness of fit”? Is it statistically significant? Calculate this question by hand.  What does tobs = 3.47 mean? What does tcrit = 3.47 mean? If the ƞ2 in an experiment is 0.6, give any possible value of ω2.

Radon is a gas emitted from the ground that can collect in houses in buildings. At certain levels it can cause lung cancer. Radon concentrations are measured in picocuries per liter (pCi/L). A radon level of 4 pCi/L is considered “acceptable” Radon levels in a house vary from week to week. In one house, a sample of 6 weeks had the following readings for radon level (in pCi/L):    1.9  2.8  3.9  3.9  4.2  5.7 Find the variance and standard deviation (definitional formula). Show your work using a table.

The following data are from an experiment on carnations. The explanatory variable is the amount of inorganic bromine (micrograms per milliliter) in a plot of standard size. The response variable is the average number of flowers per carnation plant for the 30 plants grown in the plot. Find the change in number of flowers per plant given an increase in 1 µg per mL of inorganic bromine. Amount of bromine Average no. of flowers Select one: O a. -0.216 O b. 0.216 O c. O d. -3.81 4.04 3 3.2 4 2.9 6 3.7 7 2.2 8 1.8 10 2.3 12 1.7 15 16 0.8 0.3

Calcium is essential to tree growth because it promotes the formation of wood and maintains cell walls. In 1990, the concentration of calcium in precipitation in a certain area was 0.12 milligrams per liter (mg/L). A random sample of 10 precipitation dates in 2007 results in the following data table. Complete parts (a) through (c) below. Click the icon to view the data table. - Data table (a) State the hypotheses for determining if the mean concentration of calcium precipitation has changed since 1990. Ho: P = 0.12 mg/L H₁: μ # 0.12 mg/L 0.074 0.075 0.071 0.257 0.116 0.177 0.107 0.247 0.333 0.102 (b) Construct a 90% confidence interval about the sample mean concentration of calcium precipitation. The lower bound is The upper bound is Print (Round to four decimal places as needed.) Done X