1. The reaction of an individual to a stimulus in a psychological experiment may take one of the two forms: A or B. An experimenter wishes to estimate the true proportion of people who will react in manner A. How many people must she include in the sample if she wants to estimate the true proportion with a 85% confidence interval of length 0. 06? Also, assume that a pilot study had revealed the proportion to be somewhere around 15%.

2. Suppose the sample mean lifetime of twenty-five batteries of a certain type (say Type A) was found to be 4. 1 hours with a corresponding standard deviation 0. 87 hours. Similarly, the sample mean lifetime of twenty-two batteries of another type (say Type B) was found to be 4. 9 hours with a corresponding standard deviation 0. 42 hours. At a significance level of alpha = 0. 02, is there enough evidence that Type A batteries is inferior to Type B?

In a genetics experiment, investigators looked at 300 chromosomes of a particular type and counted the number of sister-chromatid exchanges n each. A Poisson model was hypothesized for the distribution of the number of exchanges. Test the fit of a Poisson distribution to the data.

George was a participant in a visual priming experiment. He thinks that according to the study, subliminal perception can greatly influence behavior. He asks your opinion about purchasing subliminal message CDs to help him quit smoking. Research and describe some of the history of subliminal messages, their origins, and use in pop-culture. Research the online library for scholarly articles on subliminal messages and explain what you found regarding their validity. Based on what you found compare and contrast the validity of use on individuals and groups. Based on what you leaned thus far regarding learning and cognitive processes, what advice would you give George regarding quitting smoking?

Experiment: Synthesis of Benzoin:

2.6g of thiamine hydrochloride in a flask was dissolved in 8ml of water, 30 ml of ethanol was added and cooled on an ice bath. 5ml of 3M Sodium Hydroxide was added. 15ml of benzaldehyde was added and heated for 1hr.

Question 1:  how would the amount of  of reagents change if the amount of benzaldehyde was reduced to 1 ml. with calculations please?

Question 2: What is the theoretical weight of the product with calculations please?

In an experiment where you standardize EDTA with calcium carbonate and then have EDTA as the titrant and zinc as the analyte to determine the amount of zinc, which of the following are potential sources of error in the determination of the mean and relative standard deviation for the amount of zinc in your unknown?

Select all answers that apply.

1) Lack of homogeneity in the indicator solution

2) Not dissolving calcium carbonate completely

3) Inconsistencies in pipetting the zinc unknown

4) Systematic error in the buret calibrations

5) Failing to quantitatively transfer calcium carbonate

6) Sharing the indicator bottle

7) Over-titrating

In the description of the following experiment, determine the experimental factor. During a study testing a new vaccine for Zika virus, the research team grouped the volunteers enrolled for the test into Group A and Group B. Group A received an inert drug (placebo) while Group B received the vaccine.

Select the correct answer below:

whether or not a person contracts the Zika virus

the effectiveness of the new vaccine

the drug received by each group

the group receiving the new vaccine

To evaluate the effectiveness of a new type of plant food developed for tomatoes, an experiment was conducted in which a random sample of 56 seedlings was obtained from a large greenhouse having thousands of seedlings. Each of the 56 plants received 80.5 grams of this new type of plant food each week for 9 weeks. The number of tomatoes produced by each plant was recorded yielding the following results: ?bar =31.08 . ?=4.325

A researcher has started with a new sample and a given degree of confidence that the average number of tomatoes the seedlings produced on the new plant food is between "35.64258 and 37.63742". Suppose the sample size and standard deviation are the same as given above. What alpha did the researcher use in the construction of this statement?

The water used in this experiment is sparged with nitrogen to remove any dissolved oxygen. The proton-coupled reduction of oxygen is shown in the following half reaction:

O2 + 4 H⁺ + 4 e^- = 2 H2O

a.Explain why sparging a solution with N2to remove dissolved oxygen is an equilibrium process.

b.Using the half reaction above, write the balanced equation for the reaction of ascorbic acid with oxygen. Show your work.

c.If you didn’t know whether or not O2is capable of oxidizing ascorbic acid, how would you determine this by consulting data? What data would you consult and what would you look for? (Simply trying the reaction is not an acceptable answer.)

In an experiment electrons are released with a kinetic energy of 2.8 eV. The amazing physicists doing the experiments are increasing the wavelength by 50%. Do you remember what happens? Are the photoelectrons faster or slower? The energy now is 0.44 eV.

A) Based on that information, what is the material of the cathode? (calculate the work function and compare to table 28.1 in our textbook).

B) What is the initial wavelength of the light?

C) When you go a few pages back in the textbook you can find out the temperature of a physical object radiating at that wavelength

An experiment was conducted to see the effectiveness of two antidotes to three different doses of a toxin. The antidote was given to a different sample of participants five minutes after the toxin. Twenty-five minutes later the response was measured as the concentration in the blood. What can the researchers conclude with α = 0.01?

a) What is the appropriate test statistic?
---Select--- na one-way ANOVA within-subjects ANOVA two-way ANOVA

b) Compute the appropriate test statistic(s) to make a decision about H₀.
Antidote: critical value =  ; test statistic =
Decision:  ---Select--- Reject H0 Fail to reject H0

Dose: critical value =  ; test statistic =
Decision:  ---Select--- Reject H0 Fail to reject H0

Interaction: critical value =  ; test statistic =
Decision:  ---Select--- Reject H0 Fail to reject H0