The characteristics of check teeth (e.g., molars) can provide anthropologists with information on the dietary habits of extinct mammals. The check teeth of an extinct primate species was the subject of research reported in the American Journal of Physical Anthropology (Vol. 142, 2010). A total of 18 check teeth extracted from skulls discovered in western Wyoming were analyzed. Each tooth was classified according to degree of wear (unworn, slight, light-moderate, moderate, moderate-heavy, or heavy). The 18 measurements are listed here. Data on Degree of Wear Unknown Slight Unknown Slight Unknown Heavy Moderate Unknown Slight Light-moderate Unknown Light-moderate Moderate-heavy Moderate Moderate Unworn Slight Unknown Identify the variable measured in the study and its type (qualitative and quantitative) Form frequency distribution. Identify the degree of wear category that occurred most often in the sample of 18 check teeth

. In order to estimate the difference between the average Miles per Gallon of two different models of automobiles, samples are taken and the following information is collected.Model A Model BSample Size 60 55Sample Mean 28 25Sample Variance 16 9

A researcher hopes to measure the exposure a large number of individuals who have already developed lung cancer had to secondhand smoke throughout their lifetime. Which study design may prove useful in helping the researcher measure the exposure the individuals had to second hand smoke?   A) A case series B) A retrospective cohort study C) A prospective cohort study D) A case-control study

Students at a major university in Southern California are complaining of a serious housing crunch. According to many of these students, they have to commute too far to school, and so university officials should build more housing near campus. In response, the officials studied the commute distance (in miles) of 71 students at the university and published the following frequency distribution in the school paper.   Commute distance (in miles) Frequency 1 to 5 20 6 to 10 21 11 to 15 14 16 to 20 7 21 to 25 5 26 to 30 4 Based on the frequency distribution, using the midpoint of each data class, estimate the mean commute distance for the students. For your intermediate computations, use four or more decimal places, and round your answer to one decimal place.

A company wishes to test five different types of tires: A, B, C, D and E. The lives of the tires are given in the table below, where each type has been tried on six similar automobiles. Determine whether there is a significant difference between the tires at a) 0.05 level b) 0.01 level. c) If there is a significant difference among the tires, find the pair (s) which has (have) significant difference in 0.05 level. Life of tires (1000 km) A:53 61 58 64 50 56 B:63 64 67 61 65 68 C:50 59 56 53 54 48 D:46 54 51 48 53 44 E:56 61 51 58 63 49 16:44 BFF A

The income of residents of Chicago, IL has a bell shaped and symmetric histogram, with a mean of $65,000 and a S.D. of $13,000.  1) What percentage of residents have an income more than $78,000 or less than $52,000?   2) what percentage of residents have an income between $39,000 and $91,000?   3) What percentage of residents have an income less than $104,000?  4) What percentage have an income more than $65000?  5)  Less than $26,000 Hint: you need to draw a curve for each part 1-4, and calculate the mean ± 1, 2, 3 S.D.

This question refers to excavations at a national monument. One question the archaeologists asked was: Is raw material used by prehistoric Indians for stone tool manufacture independent of the archaeological excavation site? Two different excavation sites gave the information in the following table. Use a chi-square test with 5% level of significance to test the claim that raw material used for construction of stone tools and excavation site are independent. Stone Tool Construction Material Material Site B Row Total Basalt 768 547 1315 Obsidian 101 94 195 Pedernal chert Other Column Total 536 499 1035 179 1496 1228 2724 (a) What is the level of significance? State the null and alternate hypotheses. O Ho: Stone tool material and site are independent. H: Stone tool material and site are not independent. O Ho: Stone tool material and site are not independent. H: Stone tool material and site are independent. O Ho: Stone tool material and site are independent. H: Stone tool material and…

A certain company will purchase the house of any employee who is transferred out of state and will handle all details of reselling the house. The purchase price is based on two assessments, one assessor being chosen by the employee and one by the company. Based on the sample of eight assessments shown, do the two assessors agree? Use the .01 level of significance.  Assessments of Eight Homes ($ thousands) Assessed by Home 1 Home 2 Home 3 Home 4 Home 5 Home 6 Home 7 Home 8 Company 330 345 452 270 298 286 537 744 Employee 317 350 473 280 307 283 523 769    Click here for the Excel Data File (a) Choose the appropriate hypotheses. Assume d = company assessed value – employee assessed value. multiple choice 1 H0: μd = 0 versus H1: μd ≠ 0. H0: μd ≠ 0 versus H1: μd = 0.  (b) State the decision rule for .01 level of significance. (Round your answers to 2 decimal places. A negative value should be indicated by a minus sign.) Reject the null hypothesis if tcalc <  or…

I need help with number 8, 4, and 5. Thank you so much :)

Below example 1 in section 3.4 in the textbook, there is a bold text on "A disadvantage of the mean ".If we have a sample of salaries of $20,000, 30,000, $40,000, $50,000, and $3,000,000, which is the best measure for central tendency? a) Meanb) Medianc) ModeType the correct word in the answer blank.