James

You add 0.325 g of an orange, crystalline compound whose empirical formula is to 17.44 g of benzene. The boiling point of the benzene rises from 80.10 °C to 80.23 °C

A) Seed dormancy ensures that a seedling does not germinate when a source of food is not available for the young seedling.

B) Seed dormancy allows seeds to germinate when conditions are favorable for seedling growth.

C) Seed dormancy ensures that a seedling does not compete with its parents.

D) Seed dormancy increases the longevity of an individual sporophyte plant.

Calculate the mass of nickel(II) sulfate and the mass of water contained in 200. g of a 6% solution of nickel (II) sulfate.

Please help! Show the work you did to come to the answer. Thank you!

A man who is a nontaster (t/t) with type A blood marries a woman who is a taster (T/t) with type B blood. Their first child has type O blood. What is the probability that their next child will be a taster with type A blood?

In maize (corn plants) a dominant allele I inhibits kernel color, while the recessive allele i permits color when homozygous. At a different locus, the dominant allele P causes purple kernel color, while the homozygous recessive genotype pp causes red kernels.

If plants heterozygous at both loci are crossed, what will be the phenotypic ratio of the offspring?

_____ colorless: _____ purple: _____ red

Imagine that a newly discovered, recessively inherited disease is expressed only in individuals with type O blood, although the disease and blood group are independently inherited.

A normal man with type A blood and a normal woman with type B blood have already had one child with the disease. The woman is now pregnant for a second time.

Assuming that both parents are heterozygous for the gene that causes the disease, what is the probability that the second child will also have the disease? Express your answer as a fraction using the slash symbol and no spaces.

Karen and Steve each have a sibling with sickle-cell disease. Neither Karen nor Steve nor any of their parents have the disease, and none of them have been tested to see if they have the sickle-cell trait.

Based on this incomplete information, calculate the probability that if this couple has a child, the child will have sickle-cell disease. Express your answer as a fraction using the slash symbol and no spaces.

Imagine that you are a genetic counselor, and a couple planning to start a family comes to you for information. Charles was married once before, and he and his first wife had a child with cystic fibrosis. The brother of his current wife, Elaine, died of cystic fibrosis. Neither Charles, Elaine, nor their parents have cystic fibrosis.

What is the probability that Charles and Elaine will have a baby with cystic fibrosis? Express your answer as a fraction using the slash symbol and no spaces.

Please help and explain how you did it.

In the summer of 2002, a group of students took an SRS of size 25 from a compiled list of the 220 top grossing films over the last 11 years. For each film in the sample, the number of products that were subtly planted in the picture per hour was recorded, as well as the film’s rating. From the rating, we can infer who the target audience is for each film – we will assume that G, PG, and PG-13 films are all for children, and that R movies are strictly for adults. In this exercise, we will test the following theory: On average, filmmakers plant more product ads in children’s films than in adult films. Set α = 0.10. Below are the descriptive statistics. Assume all conditions are met.

group statistics

target audience N mean SD

kids 14 16.1481 9.571183

adults 11 8.65196 11.125909

What is the test statistic? Give your answer to 3 decimal places.

Estimate the p-value for the test? Use 2 decimal places

You are trying to overhear a most interesting conversation, but from your distance of 10.0m , it sounds like only an average whisper of 20.0dB . So you decide to move closer to give the conversation a sound level of 60.0dB instead. How close should you come?

What intensity I_1 corresponds to 20.0dB?

Using this equation

I = I_0*10^(B/10)

Help I don't know where to plug things into.

A train is traveling at 30.0 m/s relative to the ground in still air. The frequency of the note emitted by the train whistle is 262 Hz.

The speed of sound in air should be taken as 344 m/s.

What frequency f (recede) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and receding from it?

Express your answer in hertz.

A train is traveling at 30.0 m/s relative to the ground in still air. The frequency of the note emitted by the train whistle is 262 Hz.

The speed of sound in air should be taken as 344 m/s.

What frequency f (approach) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and approaching it?

The values of intensity at the points of interest are not given explicitly. Instead you are given the values of the intensity level at those points. Consturct a convenient expression for the intensity I that corresponds to an intensity level β with respect to a reference intensity I0.

Express your answer in terms of some or all of the variables β and I0.

Equation:

β=10log(I/I0)

Help I am having trouble solving for I.

For a test of H0: = 0.50, the z test statistic equals 1.04.

Use 3 decimal places.

(a) What is the p-value for H: > 0.50?

(b) What is the p-value for H: 0.50?

(c) What is the p-value for H: < 0.50? (Hint: The p-values for the two possible one-sided tests must sum to 1.)

(d) Which of the p-values give strong evidence against H0? Select all that apply.

The p-value in (a).

The p-value in (b).

The p-value in (c).

None of the p-values give strong evidence against H0.(d)

Two researchers conduct separate studies to test H0: p = 0.50 against Ha: p 0.50, each with n = 400. Researcher A has 220 observations in the category of interest, and p^^\^A = 220/400 = 0.550. Researcher B has 219 in the category of interest, and p^^\^B = 219/400 = 0.5475.

For researcher A, what is the ...

...test statistic? Use 2 decimal places. _________

...p-value? Use 3 decimal places. ___________

(b) For researcher B, what is the ...

...test statistic? Use 2 decimal places. __________

...p-value? Use 3 decimal places. ____________

Help I have no idea how to do this. Please show steps so I can learn how you do this.

Two researchers conduct separate studies to test H0: = 0.50 against Ha: 0.50, each with n = 400. Researcher A has 220 observations in the category of interest, and A = 220/400 = 0.550. Researcher B has 219 in the category of interest, and B = 219/400 = 0.5475.

(a) For researcher A, what is the ...

...test statistic? Use 2 decimal places.

(b)...p-value? Use 3 decimal places.

For researcher B, what is the ...

(c)...test statistic? Use 2 decimal places.

(d)...p-value? Use 3 decimal places.

(e) Are the results of the two researchers different from one another in a practical sense? What does this imply?

A) No. That is why it is important to report decisions only.

B) No. That is why it is important to report p-values and not just decisions.

(f)Using 3 decimal places, what is the 95% confidence interval for for ...

...Researcher A?

...Researcher B?

The mean blood cholesterol level for all men aged 20 to 34 years is μ = 188 mg/dl. We suspect that the mean for cross-country runners is lower. We take a random sample from all cross-country runners and measure the cholesterol level of each runner. We set α = .10 and correctly calculate a p-value of .08. Suppose someone else has additional information unavailable to us and it is known that IN REALITY cross-country runners actually do have lower lower cholesterol levels. Based on our calculations, what conclusion did we reach and did we make an error?

A) We will have concluded the data provided statistical evidence that cross-country runners do have lower cholesterol levels than all men and we will have made a Type II error.

B) We will have concluded the data provided statistical evidence that cross-country runners have lower cholesterol levels than all men and we will have made no error.

C) We will have concluded the data did not provide statistical evidence that cross-country runners do have lower cholesterol levels than all men and made a Type I error.

A standing wave on a string that is fixed at both ends has frequency 80.0 Hz. The distance between adjacent antinodes of the standing wave is 20.0 cm. What is the speed of the waves on the string, in m/s?