Flag
a researcher takes a sample from a population and computes a statistic for the sample, which of the following statements is correct? Please explain
a. sample stat. overestimates the corresponding population parameter, then stat. is biased
b. sample stat. underestimates the corresponding population parameter, then stat. is biased
c. sample stat. is equal to the corresponding population parameter, then stat. is unbiased
d. none of
21. The SH2 domain of STAT proteins plays a key role in cytokineseceptor signaling. This domain can bind to phosphotyrosine ... A) on an activated receptor molecule, or (intramolecularly) on the same STAT molecule. B) on a Janus kinase molecule, or (intramolecularly) on the same STAT molecule. on an activated receptor molecule, or on another STAT molecule in a dimer. on a Janus kinase molecule, or on another STAT molecule in a dimer. E) on the same STAT molecule or on another STAT molecule in a dimer.20. In the mammalian eye, the lens is composed of a large number of cells called lens cells. Only lens cells along the edges are close to a blood supply where they exchange nutrients and waste molecules. Lens cells in the middle of the lens are connected via gap junctions. Cataracts appear as a cloudiness that develops in the lenses of the eye, often with age. Biologists have suspected that cataracts result from a disruption in intercellular communication between lens cells through gap junctions. Which type of investigation would best provide more information about whether gap junctions are involved in cataract formation? Engineer mice to carry a mutation that knocks out connexin protein, and test to see whether these mice develop cataracts at a younger age than control mice. O Break open lens cells that have developed cataracts, isolate the cytoplasmic fraction, and test it for elevated nitric oxide levels. Quantitatively compare mRNA transcripts in lens cells that have been affected by cataracts, and compare them to unaffected controls. O Measure CAMP levels inside lens cells that have developed cataracts, and compare them to controls without cataracts. Count the gap junctions in lens cells, and compare to the number of gap junctions found in other cells, such as heart cells.4. The dean of the math department wants to determine what portion of stat 1 students would be interested in taking stat 2. A simple random sample o of them f 152 student who have taken stat 1 finds that 68 of them would be interested in stat 2. Construct a 95% confidence interval for the proportion of students who took stat 1 that would be interested in stat 2 based on this sample.Consider the following class declarations when answering this question: class dog record class dog_Info publici public: int age: void operator +(const dog record & s); string name: Int wins: private: int races //cells in used Int capacity /tot cells dog record "dog stats: //dyn array Implement the overloaded "operator+" without chaining. This function will add a dog record to dog stats only if the name field does not match any of the dog records stored In dog stats. If a name matches any record In dog stats, do not add it and print the message "duplicate record". if dog stats is full print the message "dog stats full" 12p Paragraph
